Slashdot Mirror

brlcad writes "After 20 years of active development under a proprietary government license agreement, the BRL-CAD solid modeling suite has just been released as Open Source software. BRL-CAD is one of the many legacies of the late Michael Muuss, author of ping. The package began on the PDP-11 and VAX 11/780--before the emergence of ANSI/ISO C language standards--and boasts one of the first parallel Ray tracers in existence. Today BRL-CAD has over 750,000 lines of source code. It incorporates both 3D modeling and rendering capabilities, and supports an API for user-developed geometric analysis applications. It continues to be developed and maintained by the U.S. Army Research Laboratory and its partners. Various portions of the package are distributed under the GPL, LGPL, GFDL, and BSD licenses."

brlcad writes "After 20 years of active development under a proprietary government license agreement, the BRL-CAD solid modeling suite has just been released as Open Source software. BRL-CAD is one of the many legacies of the late Michael Muuss, author of ping. The package began on the PDP-11 and VAX 11/780--before the emergence of ANSI/ISO C language standards--and boasts one of the first parallel Ray tracers in existence. Today BRL-CAD has over 750,000 lines of source code. It incorporates both 3D modeling and rendering capabilities, and supports an API for user-developed geometric analysis applications. It continues to be developed and maintained by the U.S. Army Research Laboratory and its partners. Various portions of the package are distributed under the GPL, LGPL, GFDL, and BSD licenses."

brlcad writes "After 20 years of active development under a proprietary government license agreement, the BRL-CAD solid modeling suite has just been released as Open Source software. BRL-CAD is one of the many legacies of the late Michael Muuss, author of ping. The package began on the PDP-11 and VAX 11/780--before the emergence of ANSI/ISO C language standards--and boasts one of the first parallel Ray tracers in existence. Today BRL-CAD has over 750,000 lines of source code. It incorporates both 3D modeling and rendering capabilities, and supports an API for user-developed geometric analysis applications. It continues to be developed and maintained by the U.S. Army Research Laboratory and its partners. Various portions of the package are distributed under the GPL, LGPL, GFDL, and BSD licenses."

brlcad writes "After 20 years of active development under a proprietary government license agreement, the BRL-CAD solid modeling suite has just been released as Open Source software. BRL-CAD is one of the many legacies of the late Michael Muuss, author of ping. The package began on the PDP-11 and VAX 11/780--before the emergence of ANSI/ISO C language standards--and boasts one of the first parallel Ray tracers in existence. Today BRL-CAD has over 750,000 lines of source code. It incorporates both 3D modeling and rendering capabilities, and supports an API for user-developed geometric analysis applications. It continues to be developed and maintained by the U.S. Army Research Laboratory and its partners. Various portions of the package are distributed under the GPL, LGPL, GFDL, and BSD licenses."

Dan Brickley writes "It appears that Iranian ISPs have been ordered to block a large number of popular Web sites, including weblogging, community, chat and email services. Web (particularly weblog) use has been increasing rapidly in Iran, with 64000+ weblogs published by Iranians via various sites. As of today, if the news is correct, the majority of these may be inaccessible to their authors, as will the email (eg. Yahoo) services they use to communicate with friends, colleagues and family worldwide. See stop.censoring.us and hoder.com for more details. The newly expanded blocks include PersianBlog, Blogger and the Google-hosted Orkut 'social networking' site, where Iranians come third after Brazil and USA, representing 7% of all users. How can we get our Iranian friends back in the Web?"

soren.harward writes "The New Scientist has an article about TinyP2P, the world's smallest P2P app. It's 15 lines of Python code brought to us by Edward Felten, CS Professor at Princeton and outspoken supporter of the digital rights the Slashdot community holds so dear. He wrote the program as a proof-of-concept that P2P apps are really easy to write, don't have to be complicated, and thus banning them (a la the INDUCE Act) is pointless and silly."

jangobongo writes "The Texas company that built and owns the Biosphere 2 Center near Tucson, AZ has put the property up for sale. Built at a cost of over $200 million, Biosphere 2 was originally used as a a self-sustaining environment for humans with eight "biospherians" sealing themselves in for two years to see if they could survive without outside intervention. The Biosphere 2 campus consists of a 3.1-acre glass terrarium and 70 other buildings on 140 acres, and includes offices, classrooms, laboratories, residential housing, and a hotel and conference center. Because it is a very expensive place to operate, the more than 85,000 visitors last year were not enough to make money on tourism alone. Potential uses for the property: a religious college, spa, golf resort or even a technology park."

An anonymous reader writes "It is a long-standing and unsolved mystery why 80% of all planetary nebulae are not spherical. Theories suggest that magnetic fields play a role in shaping planetary nebulae. A team of astronomers from Germany has now discovered the first direct clue that magnetic fields might indeed create these remarkable shapes. Planetary nebulae are expanding gas shells that are ejected by Sun-like stars at the end of their lifetimes."

MattHaffner writes "Yesterday, a status report from the Far Ultraviolet Spectroscopic Explorer (FUSE) operations center reports that the satellite is in 'safe mode' after losing (another) reaction wheel--the mechanisms used to point the spacecraft. FUSE had been operating with only two of three original wheels for about two years using a creative solution utilizing the earth's magnetic field. Losing a second wheel for good may mean a serious reduction in science, however. For those keeping track, this is the third major blow to UV astronomy in less than a year. The Cosmic Origins Spectrograph (COS) was due to be installed on the canceled SM4, and the Space Telescope Imaging Spectrograph (STIS), a major instrument on HST, failed in 2004 Aug. The infrared is well covered by current and upcoming NASA missions including the Spitzer Space Telescope, the James Webb Space Telescope (JWST), and SOFIA, but ultraviolet astronomy may have a serious dearth of instruments in the near future. While IR is useful for studying dusty environments, star formation, planetary system formation, and red-shifted galaxies, the UV is the best place to study the chemical composition and evolution of interstellar gas, stars, and galaxies since many of the more abundant elements have strong spectral signatures in that region of the spectrum."

wikinerd writes "Wikipedia is under criticism by its co-founder Larry Sanger who has left the project. He warns of a possible future fork due to Wikipedia's Anti-Elitism and he presents his view on Wikipedia's (lack of) reliability. New wikis on various subjects have already emerged, with some of them being complete forks of Wikipedia. Critical articles on Wikipedia are also being published by other sources."

SonicSpike writes "A University of Central Florida ham radio operator K4VUD (and founder of their film program) was caught in Port Blair during the earthquake and following tsunami! He and a team of other ham radio operators arrived in the Andaman and Nicobar Islands to setup the region's first ham station 2 weeks prior to the disaster. Once they realized what happened they immediately began transmitting for 20 straight hours using car batteries as a power source. Most cellular and land-line communication was down. His team became the main link to the rest of the world from the region."

blamanj writes "In the beginning was Darwinism, then there arose Social Darwinism, now physicists are proposing Quantum Darwinism. According to the Nature article: "If, as quantum mechanics says, observing the world tends to change it, how is it that we can agree on anything at all? Why doesn't each person leave a slightly different version of the world for the next person to find? Because, say the researchers, certain special states of a system are promoted above others by a quantum form of natural selection, which they call quantum darwinism. Information about these states proliferates and gets imprinted on the environment. So observers coming along and looking at the environment in order to get a picture of the world tend to see the same 'preferred' states."."

Jem Berkes writes "This week I launched CleanSoftware.org, a resource site with a unique goal: listing free, daily-use software that is free from spyware, adware, and other malicious/intrusive components. With Windows users increasingly believing that free software invariably means adware or spyware, I set out to promote good, clean, free software. Perhaps geeks helping family and friends set up their new computers this holiday can make use of this resource; sticking to clean software is much easier than struggling with never-ending cleanups. To expand my listing, I am also looking for input from the Slashdot readership: what other free, clean desktop software do you regularly use that Windows users should know about?"

Numerous readers wrote in with bits about a potential asteroid collision: "The recently discovered asteroid 2004 MN4 is currently listed as having a 1/233 chance of hitting the Earth. It is 420 m across and if it strikes the Earth it will release an energy of 1,900 Megatons of TNT (the largest nuclear weapon ever detonated, Tsar Bomba had a yield of only 50 Megatons). It is also the only asteroid that currently has a Torino scale value of 2." So, in summary, there's a 1-in-233 chance of the worst disaster in recorded history happening on April 13, 2029, and a 232-in-233 chance of nothing happening. Have a nice day! Update: 12/24 22:14 GMT by M : The rock is now rated a 4 on the Torino scale, or a 1-in-62 chance of impact.

Phoe6 writes "MIT Tech Review is running an article on Larry Sanger, an epistemologist and the co-creator of Wikipedia. It is very interesting to know his views on Wikipedia. He says, 'To build a public encyclopedia, you don't need faith in the possibility of knowledge, What you have to have faith in is human beings being able to work together.'"

pluke writes "Computer and Video Games reports that Nintendo plans to drop the humble d-pad from its next console along with the classic A and B buttons. Nintendo pioneered the d-pad on its 80's Game & Watch handheld games system."

pluke writes "Computer and Video Games reports that Nintendo plans to drop the humble d-pad from its next console along with the classic A and B buttons. Nintendo pioneered the d-pad on its 80's Game & Watch handheld games system."

Neil Halelamien writes "In a recent interview with the Desert Sun, Burt Rutan talks about the future of SpaceShipOne and SpaceShipTwo. The bad news is that SpaceShipOne will be retired straight to the Smithsonian Air and Space Museum, despite getting five different requests to fly suborbital payloads. The good news is that efforts are being focused on SpaceShipTwo, which will carry nine people, and fly higher and further downrange than SpaceShipOne. Virgin Galactic will purchase a fleet of five of these vehicles, which will start test flights in 2007. Virgin Galactic may end up competing with Jeff Bezos's Blue Origin, which is rumored to be developing a VTOL suborbital vehicle. Also interesting to watch will be Rutan's involvement with t/Space, one of the companies contracted by NASA to conduct concept studies for the Vision for Space Exploration."

Neil Halelamien writes "In a recent interview with the Desert Sun, Burt Rutan talks about the future of SpaceShipOne and SpaceShipTwo. The bad news is that SpaceShipOne will be retired straight to the Smithsonian Air and Space Museum, despite getting five different requests to fly suborbital payloads. The good news is that efforts are being focused on SpaceShipTwo, which will carry nine people, and fly higher and further downrange than SpaceShipOne. Virgin Galactic will purchase a fleet of five of these vehicles, which will start test flights in 2007. Virgin Galactic may end up competing with Jeff Bezos's Blue Origin, which is rumored to be developing a VTOL suborbital vehicle. Also interesting to watch will be Rutan's involvement with t/Space, one of the companies contracted by NASA to conduct concept studies for the Vision for Space Exploration."

Neil Halelamien writes "In a recent interview with the Desert Sun, Burt Rutan talks about the future of SpaceShipOne and SpaceShipTwo. The bad news is that SpaceShipOne will be retired straight to the Smithsonian Air and Space Museum, despite getting five different requests to fly suborbital payloads. The good news is that efforts are being focused on SpaceShipTwo, which will carry nine people, and fly higher and further downrange than SpaceShipOne. Virgin Galactic will purchase a fleet of five of these vehicles, which will start test flights in 2007. Virgin Galactic may end up competing with Jeff Bezos's Blue Origin, which is rumored to be developing a VTOL suborbital vehicle. Also interesting to watch will be Rutan's involvement with t/Space, one of the companies contracted by NASA to conduct concept studies for the Vision for Space Exploration."

Neil Halelamien writes "In a recent interview with the Desert Sun, Burt Rutan talks about the future of SpaceShipOne and SpaceShipTwo. The bad news is that SpaceShipOne will be retired straight to the Smithsonian Air and Space Museum, despite getting five different requests to fly suborbital payloads. The good news is that efforts are being focused on SpaceShipTwo, which will carry nine people, and fly higher and further downrange than SpaceShipOne. Virgin Galactic will purchase a fleet of five of these vehicles, which will start test flights in 2007. Virgin Galactic may end up competing with Jeff Bezos's Blue Origin, which is rumored to be developing a VTOL suborbital vehicle. Also interesting to watch will be Rutan's involvement with t/Space, one of the companies contracted by NASA to conduct concept studies for the Vision for Space Exploration."

museumpeace writes "CNET has an article about a robotic exoskeleton ginned up by tinkerer from Alaska There are a few cool pictures. The audacity of Mr. Owens project, if you believe the article, compares to the efforts of the old Home Brew Computer Club when compared to the work of GE or Toyota. Inspiration here comes more from sci-fi and video games than from industrial competition. The article is a good roundup of MECHA related developments, some of which sprang from DARPA money, so I am glad at least a few of my tax dollars are having some real geek fun."

Iphtashu Fitz writes "On December 23, 1954, Richard Herrick made history by becoming the first successful recipient of a donated organ. His twin brother Ronald sacrificed one of his kidneys, which prolonged Richards life by another 8 years. In the last 12 years alone over 416,000 people have received organ transplants (an average of almost 100 a day), and one man has now lived 42 years with a donated kidney. Since that first historic operation in 1954 surgeons have learned how to transplant virtually every vital organ in the human body, and have even performed two hand transplants. Some doctors have also experimented with transplanting organs from other species into humans. What's next on the path to a full-fledged Frankenstein monster? How about a face transplant? Just last month the Cleveland Clinic was given permission to attempt the procedure and they are now searching for a suitable patient."

Alexandre Van de Sande writes "Robin Sloan made a flash video as a "documentary" of how big enterprises like google and amazon converged medias and changed the way we see news by 2014. It's a vision of what could be (or will be) the world with personalized media, made by peers, and the guy knows what's going on on those big heads. It ends with a sad view on which, althought some people get their news in a way they could never before, most of them just get a bunch of untrue gossip and sensasionalist trivia. And that's exactly what they wanted." This will take a few minutes to watch, but stick it out to the end. I think there's a lot in there that you really should think about.

Neil Halelamien writes "The LA Times has an article on various cognitive enhancement drugs which are currently undergoing clinical trials. These include ampakines which amplify the strength of electrical signals between neurons, HT-0712 which enhances the transfer from short-term to long-term memory, and gene therapy which revitalizes existing neurons. The article also describes successes with the drug Modafinil, which seems to sharpen attention and mental agility. The side effects of these sorts of drugs are not yet fully known, although many neuroscientists think that they may lead to 'mental clutter' or task-obsessiveness."

Neil Halelamien writes "The LA Times has an article on various cognitive enhancement drugs which are currently undergoing clinical trials. These include ampakines which amplify the strength of electrical signals between neurons, HT-0712 which enhances the transfer from short-term to long-term memory, and gene therapy which revitalizes existing neurons. The article also describes successes with the drug Modafinil, which seems to sharpen attention and mental agility. The side effects of these sorts of drugs are not yet fully known, although many neuroscientists think that they may lead to 'mental clutter' or task-obsessiveness."

Neil Halelamien writes "The LA Times has an article on various cognitive enhancement drugs which are currently undergoing clinical trials. These include ampakines which amplify the strength of electrical signals between neurons, HT-0712 which enhances the transfer from short-term to long-term memory, and gene therapy which revitalizes existing neurons. The article also describes successes with the drug Modafinil, which seems to sharpen attention and mental agility. The side effects of these sorts of drugs are not yet fully known, although many neuroscientists think that they may lead to 'mental clutter' or task-obsessiveness."

Octagon Most writes "Cerulean Studios has released Trillian Pro 3.0 which is still interacting with AIM, Yahoo, MSN instant messagers with impunity. It has a cool new Instant Lookup feature which links to Wikipedia, and a serverless messaging mode using Rendezvous. The free version is now Trillian Basic 3.0. Trillian is still Windows only, and if you don't like the FAQ response regarding Linux and Mac support let 'em know."

fenimor writes "Saturn, the sixth planet from the Sun, is probably best known for its famous planetary rings. They extend from 6,630 km to 120,700 km above Saturn's equator, and are composed of silica rock, iron oxide, and ice particles. A massive eruption of atomic oxygen from Saturn's outer rings, seen by Cassini's ultraviolet camera, may be an indication that the planet's wispy E ring is eroding so fast that it could disappear within 100 million years if not replenished."

Neil Halelamien writes "The European Space Agency has announced the 2005 Clarke-Bradbury International Science Fiction competition. For the competition, the ESA's Innovative Technologies from Science Fiction for Space Applications (ITSF) project is accepting short stories and artwork which incorporates or depicts a space elevator in some way. The competition is open to members of all nations, with a submission deadline of February 25, 2005. Winners and runners-up in each category will receive $600 and $300 respectively, with winning entries appearing in an upcoming book on the space elevator."

Neil Halelamien writes "The European Space Agency has announced the 2005 Clarke-Bradbury International Science Fiction competition. For the competition, the ESA's Innovative Technologies from Science Fiction for Space Applications (ITSF) project is accepting short stories and artwork which incorporates or depicts a space elevator in some way. The competition is open to members of all nations, with a submission deadline of February 25, 2005. Winners and runners-up in each category will receive $600 and $300 respectively, with winning entries appearing in an upcoming book on the space elevator."

Iphtashu Fitz writes "The Associated Press is reporting that a Michigan man has been sentenced to 9 years in prison for his involvement in hacking into the corporate systems of Lowe's Home Improvement and attempting to steal customer credit card information. The sentence far exceeds the 5 1/2 years that hacker Kevin Mitnick spent behind bars. Two others are awaiting sentencing, including one of the first people to ever be convicted of wardriving. Prosecutors said the three men tapped into the wireless network of a Lowe's store in Southfield, Mich., used that connection to enter the chain's central computer system in North Wilkesboro, N.C., and installed a program to capture credit card information. No data was actually collected however."

book_reader (Gary Cornell) writes "Wow, what an intriguing title! When I was getting my Ph.D in math, the words 'sex' and 'mathematics' were not juxtaposed all that often, and I suspect we would have been more likely to expect a book titled 'Mathematics and the (lack of) Sex.' But, hey, times change and the author, who is not only a mathematician but also someone who was voted one of Australia's 50 most beautiful people in their equivalent of People magazine -- and remember this is the land of Nicole Kidman -- has a point. As she says, echoing G.H. Hardy's famous comment in 'A Mathematician's Apology': 'Mathematics is the study of patterns: their discovery, their interconnections and their implications.' And what is sexual behavior but the most intriguing pattern of all?" Read on for the rest of Cornell's review. Mathematics and Sex author Clio Cresswell pages 177 publisher Allen & Unwin rating 8/10 reviewer book_reader ISBN 1741141591 summary A very nice introduction to the modelling of inter-personal behavior

The way one studies patterns mathematically is by building models for the behavior being modeled. This is why most of this book is about mathematical models for interpersonal behavior. Well, that together with some amusing anecdotes that make the book a fun read even if you know the literature very well. Still, before I go any further with this review I want to remind everyone that the key question to ask oneself when reading any book that does mathematical modeling of any topic is always the same: are the models built realistic?. Mathematicians can't answer this question: only research by scientists (i.e., experience) can. Einstein probably put it best when he said:

"As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality."

While we do study models for their applicability and their eventual predictive use by and for science, mathematicians can and do also study them for their intrinsic mathematics beauty, and some of the models Cresswell discusses in this book are certainly very pretty (in the mathematical sense of beauty--because the solutions are elegant, though the pun is intended.)

As an example of what this whole subject is like let me tell you about a long-studied model of interpersonal behavior that the author discusses in Chapter 3, a chapter titled "Road Testing the Bed"--I kid you not.

"You have to choose your life mate. The rules we adopt for this model are that you will be presented 100 choices one after another, you may date them, sleep with them, whatever. But, at the end, you must say yea or nay and if you say nay, you will never see them again."

What strategy should you adopt? Well, if you wait to the end, the odds are only 1/100 that the last person is the optimal choice; ditto if you choose the first person. The modeler then asks: what strategy should you adopt for optimum results? A little bit of mathematics involving infinite series gives the answer. You can prove mathematically that the best strategy is to look at (approximately) the first 36.787944117144235 people (rounding it to, say, 37 people) and then you should choose the first person from that point on that is 'better' then the previous 37 people. This increases the odds of your finding the best match from 1% to about 37%- roughly a 37 times improvement. (In the pre-politically correct literature this model was called "The Sultan's Dowry Problem," or "The Secretary Problem"; now, alas, it is usually called simply an example of an "Optimal Stopping Problem." )

Is this a good model for how we behave? Is this a strategy that one can realistically adopt? Certainly, 100 possibilities seems like a lot of choices to have if one is not the current day equivalent of a sultan -- a movie star or an athlete. But the model is intriguing, if not totally realistic and applicable.

Models that spring from modification of the rules of the Sultan problem have always been one of my favorites in this area. This makes Chapter 3 my favorite chapter: it is chock full of goodies with lots of interesting variations of the original problem, and thus even more interesting models. Some may be far more applicable. For example, if you get to play the cad and can keep potential mates 'stockpiled,' then, by stockpiling seven potential mates, there's a strategy that you can use to increase the odds of finding the best one to 96% or so! Or, in another variation of the model, whose solution she refers to as the "twelve bonk rule," there's a result that says that if you simply want to ensure that your choice is better than 90% of the other choices available, simply 'sample' the first 12 possibilities and pick the first person who is better after the first 12. This strategy gives you a 77% possibility of success.

I obviously can't go over all the models she builds, the interesting results she cites, or the interesting observations she makes in a review so let me simply give you some of the high points of the remaining chapters:

Chapter 1 is entitled "Love, sweeeet love" and mostly consists of showing you various differential equations that can model love's attraction and repulsion i.e. variations on standard "prey-predator models." For example, she mentions the following model of attraction:

"The more Romeo loves Juliet, the More Juliet wants to run away ... Romeo gets discouraged and backs off, Juliet finds him strangely attractive. Romeo tends to echo her..."

This model gives rise to a standard and very simple first order differential equation. She then talks about more sophisticated versions of this model including one by Rinaldi that tries to model a famous love poem by Petrarch. (Personally, I think these models are only useful for learning differential equations but don't shed much light on the problem.)

Chapter 2 is called "Marriage and the Happily Ever After" and describes models for behavior in a relationship, including an analysis of how absurd the folk tale is that more sex occurs in the first year of marriage then in all subsequent years combined. Probably the most interesting work she talks about in this chapter are the models by Guttman et al. intended to analyze conversations between lovers to determine if the relationship is on the rocks. In this case the models they build are known to be highly accurate in predicting problems in the relationship.

Chapter 4 is entitled "Dating Services -- are you really being served?" and it has a fascinating analysis of the perils of questionnaires that try to match too many variables (i.e. why those questionnaires don't help that much). As she points out, this is called the "curse of dimensionality" in the literature. The problem is that if you are trying to determine whether two points are very close in n-dimensional space where n is large, you are unlikely to get a whole lot of difference between points and so closeness doesn't really matter much.

Chapter 5 is called "Pairing Up," and shows how Game Theory can (should?) enter into the problem of "choice" preferences. This chapter is a very nice gateway into models that are studied in the greatest depth in economics; there is an incredibly interesting literature on these issues. One should start with Arrow's paradox on voting (that most logical axiom systems for building choice models are actually inconsistent and can't simultaneously be satisfied) and then work up to real problems with how congressional seats are allocated in the United States. Wikipedia has good articles to start with on these models.

Chapter 6 is called "Action Reaction Attraction" and is about ways to model people's attractiveness. This means things like symmetry as a cross cultural model for beauty, and waist-to-hip ratio for females as a cross-cultural model for male choice. Whether these models are correct is an extremely active area of research in anthropology and evolutionary psychology. The jury seems to still be out, but the evidence for their truth is certainly growing.

Chapter 7 is called "Pick a Sex, Any Sex" and is a tantalizing hint of what the mathematics of evolution is all about. In particular this chapter includes a nice discussion of how sex itself can evolve. (It seems paradoxical that the question of how sex itself can evolve is not yet resolved. After all, in a naive "selfish gene" approach to evolution, it would seem seem that asexual methods of reproduction win hands down. But, as usual, the issues are more complex then naive models would predict. For example, who would have thought that parasites might be the reason sex arose? Again, for more details on the science behind the models the author discusses, you can start with a useful Wikipedia article. Ridley's popular science book called the Red Queen (or anything by Maynard Smith) is where to go next.

Chapter 8 is titled "How Ovaries Count and Balls Add Up," and is about models for feedback levels of hormone concentration and circadian rhythms and didn't particular interest me.

Finally, Chapter 9 is called "Orgasm" and I'm not going to summarize it, since that would be telling.

To sum up, is this book perfect? No. I think more mathematically literate people would like appendices which give some indication of the deeper math behind what she discusses. For example, the math that shows why the answer I gave above to the Sultan's choice problem really is approximately 36.787944117144235 - or more correctly n/e, where e is the base of natural logarithms and n is the number of choices one has to go through, is well within the reach of any 2nd year calculus student. The differential equations she introduces in other chapters can be understood by anyone with a good engineering or math background. The game theory and even a proof of Arrow's theorem should be accessible to any literate person etc. As is, though, anyone with even some knowledge of or interest in mathematics will find this book great fun.

You can purchase Mathematics and Sex from bn.com. Slashdot welcomes readers' book reviews -- to see your own review here, read the book review guidelines, then visit the submission page.

book_reader (Gary Cornell) writes "Wow, what an intriguing title! When I was getting my Ph.D in math, the words 'sex' and 'mathematics' were not juxtaposed all that often, and I suspect we would have been more likely to expect a book titled 'Mathematics and the (lack of) Sex.' But, hey, times change and the author, who is not only a mathematician but also someone who was voted one of Australia's 50 most beautiful people in their equivalent of People magazine -- and remember this is the land of Nicole Kidman -- has a point. As she says, echoing G.H. Hardy's famous comment in 'A Mathematician's Apology': 'Mathematics is the study of patterns: their discovery, their interconnections and their implications.' And what is sexual behavior but the most intriguing pattern of all?" Read on for the rest of Cornell's review. Mathematics and Sex author Clio Cresswell pages 177 publisher Allen & Unwin rating 8/10 reviewer book_reader ISBN 1741141591 summary A very nice introduction to the modelling of inter-personal behavior

The way one studies patterns mathematically is by building models for the behavior being modeled. This is why most of this book is about mathematical models for interpersonal behavior. Well, that together with some amusing anecdotes that make the book a fun read even if you know the literature very well. Still, before I go any further with this review I want to remind everyone that the key question to ask oneself when reading any book that does mathematical modeling of any topic is always the same: are the models built realistic?. Mathematicians can't answer this question: only research by scientists (i.e., experience) can. Einstein probably put it best when he said:

"As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality."

While we do study models for their applicability and their eventual predictive use by and for science, mathematicians can and do also study them for their intrinsic mathematics beauty, and some of the models Cresswell discusses in this book are certainly very pretty (in the mathematical sense of beauty--because the solutions are elegant, though the pun is intended.)

As an example of what this whole subject is like let me tell you about a long-studied model of interpersonal behavior that the author discusses in Chapter 3, a chapter titled "Road Testing the Bed"--I kid you not.

"You have to choose your life mate. The rules we adopt for this model are that you will be presented 100 choices one after another, you may date them, sleep with them, whatever. But, at the end, you must say yea or nay and if you say nay, you will never see them again."

What strategy should you adopt? Well, if you wait to the end, the odds are only 1/100 that the last person is the optimal choice; ditto if you choose the first person. The modeler then asks: what strategy should you adopt for optimum results? A little bit of mathematics involving infinite series gives the answer. You can prove mathematically that the best strategy is to look at (approximately) the first 36.787944117144235 people (rounding it to, say, 37 people) and then you should choose the first person from that point on that is 'better' then the previous 37 people. This increases the odds of your finding the best match from 1% to about 37%- roughly a 37 times improvement. (In the pre-politically correct literature this model was called "The Sultan's Dowry Problem," or "The Secretary Problem"; now, alas, it is usually called simply an example of an "Optimal Stopping Problem." )

Is this a good model for how we behave? Is this a strategy that one can realistically adopt? Certainly, 100 possibilities seems like a lot of choices to have if one is not the current day equivalent of a sultan -- a movie star or an athlete. But the model is intriguing, if not totally realistic and applicable.

Models that spring from modification of the rules of the Sultan problem have always been one of my favorites in this area. This makes Chapter 3 my favorite chapter: it is chock full of goodies with lots of interesting variations of the original problem, and thus even more interesting models. Some may be far more applicable. For example, if you get to play the cad and can keep potential mates 'stockpiled,' then, by stockpiling seven potential mates, there's a strategy that you can use to increase the odds of finding the best one to 96% or so! Or, in another variation of the model, whose solution she refers to as the "twelve bonk rule," there's a result that says that if you simply want to ensure that your choice is better than 90% of the other choices available, simply 'sample' the first 12 possibilities and pick the first person who is better after the first 12. This strategy gives you a 77% possibility of success.

I obviously can't go over all the models she builds, the interesting results she cites, or the interesting observations she makes in a review so let me simply give you some of the high points of the remaining chapters:

Chapter 1 is entitled "Love, sweeeet love" and mostly consists of showing you various differential equations that can model love's attraction and repulsion i.e. variations on standard "prey-predator models." For example, she mentions the following model of attraction:

"The more Romeo loves Juliet, the More Juliet wants to run away ... Romeo gets discouraged and backs off, Juliet finds him strangely attractive. Romeo tends to echo her..."

This model gives rise to a standard and very simple first order differential equation. She then talks about more sophisticated versions of this model including one by Rinaldi that tries to model a famous love poem by Petrarch. (Personally, I think these models are only useful for learning differential equations but don't shed much light on the problem.)

Chapter 2 is called "Marriage and the Happily Ever After" and describes models for behavior in a relationship, including an analysis of how absurd the folk tale is that more sex occurs in the first year of marriage then in all subsequent years combined. Probably the most interesting work she talks about in this chapter are the models by Guttman et al. intended to analyze conversations between lovers to determine if the relationship is on the rocks. In this case the models they build are known to be highly accurate in predicting problems in the relationship.

Chapter 4 is entitled "Dating Services -- are you really being served?" and it has a fascinating analysis of the perils of questionnaires that try to match too many variables (i.e. why those questionnaires don't help that much). As she points out, this is called the "curse of dimensionality" in the literature. The problem is that if you are trying to determine whether two points are very close in n-dimensional space where n is large, you are unlikely to get a whole lot of difference between points and so closeness doesn't really matter much.

Chapter 5 is called "Pairing Up," and shows how Game Theory can (should?) enter into the problem of "choice" preferences. This chapter is a very nice gateway into models that are studied in the greatest depth in economics; there is an incredibly interesting literature on these issues. One should start with Arrow's paradox on voting (that most logical axiom systems for building choice models are actually inconsistent and can't simultaneously be satisfied) and then work up to real problems with how congressional seats are allocated in the United States. Wikipedia has good articles to start with on these models.

Chapter 6 is called "Action Reaction Attraction" and is about ways to model people's attractiveness. This means things like symmetry as a cross cultural model for beauty, and waist-to-hip ratio for females as a cross-cultural model for male choice. Whether these models are correct is an extremely active area of research in anthropology and evolutionary psychology. The jury seems to still be out, but the evidence for their truth is certainly growing.

Chapter 7 is called "Pick a Sex, Any Sex" and is a tantalizing hint of what the mathematics of evolution is all about. In particular this chapter includes a nice discussion of how sex itself can evolve. (It seems paradoxical that the question of how sex itself can evolve is not yet resolved. After all, in a naive "selfish gene" approach to evolution, it would seem seem that asexual methods of reproduction win hands down. But, as usual, the issues are more complex then naive models would predict. For example, who would have thought that parasites might be the reason sex arose? Again, for more details on the science behind the models the author discusses, you can start with a useful Wikipedia article. Ridley's popular science book called the Red Queen (or anything by Maynard Smith) is where to go next.

Chapter 8 is titled "How Ovaries Count and Balls Add Up," and is about models for feedback levels of hormone concentration and circadian rhythms and didn't particular interest me.

Finally, Chapter 9 is called "Orgasm" and I'm not going to summarize it, since that would be telling.

To sum up, is this book perfect? No. I think more mathematically literate people would like appendices which give some indication of the deeper math behind what she discusses. For example, the math that shows why the answer I gave above to the Sultan's choice problem really is approximately 36.787944117144235 - or more correctly n/e, where e is the base of natural logarithms and n is the number of choices one has to go through, is well within the reach of any 2nd year calculus student. The differential equations she introduces in other chapters can be understood by anyone with a good engineering or math background. The game theory and even a proof of Arrow's theorem should be accessible to any literate person etc. As is, though, anyone with even some knowledge of or interest in mathematics will find this book great fun.

You can purchase Mathematics and Sex from bn.com. Slashdot welcomes readers' book reviews -- to see your own review here, read the book review guidelines, then visit the submission page.

book_reader (Gary Cornell) writes "Wow, what an intriguing title! When I was getting my Ph.D in math, the words 'sex' and 'mathematics' were not juxtaposed all that often, and I suspect we would have been more likely to expect a book titled 'Mathematics and the (lack of) Sex.' But, hey, times change and the author, who is not only a mathematician but also someone who was voted one of Australia's 50 most beautiful people in their equivalent of People magazine -- and remember this is the land of Nicole Kidman -- has a point. As she says, echoing G.H. Hardy's famous comment in 'A Mathematician's Apology': 'Mathematics is the study of patterns: their discovery, their interconnections and their implications.' And what is sexual behavior but the most intriguing pattern of all?" Read on for the rest of Cornell's review. Mathematics and Sex author Clio Cresswell pages 177 publisher Allen & Unwin rating 8/10 reviewer book_reader ISBN 1741141591 summary A very nice introduction to the modelling of inter-personal behavior

The way one studies patterns mathematically is by building models for the behavior being modeled. This is why most of this book is about mathematical models for interpersonal behavior. Well, that together with some amusing anecdotes that make the book a fun read even if you know the literature very well. Still, before I go any further with this review I want to remind everyone that the key question to ask oneself when reading any book that does mathematical modeling of any topic is always the same: are the models built realistic?. Mathematicians can't answer this question: only research by scientists (i.e., experience) can. Einstein probably put it best when he said:

"As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality."

While we do study models for their applicability and their eventual predictive use by and for science, mathematicians can and do also study them for their intrinsic mathematics beauty, and some of the models Cresswell discusses in this book are certainly very pretty (in the mathematical sense of beauty--because the solutions are elegant, though the pun is intended.)

As an example of what this whole subject is like let me tell you about a long-studied model of interpersonal behavior that the author discusses in Chapter 3, a chapter titled "Road Testing the Bed"--I kid you not.

"You have to choose your life mate. The rules we adopt for this model are that you will be presented 100 choices one after another, you may date them, sleep with them, whatever. But, at the end, you must say yea or nay and if you say nay, you will never see them again."

What strategy should you adopt? Well, if you wait to the end, the odds are only 1/100 that the last person is the optimal choice; ditto if you choose the first person. The modeler then asks: what strategy should you adopt for optimum results? A little bit of mathematics involving infinite series gives the answer. You can prove mathematically that the best strategy is to look at (approximately) the first 36.787944117144235 people (rounding it to, say, 37 people) and then you should choose the first person from that point on that is 'better' then the previous 37 people. This increases the odds of your finding the best match from 1% to about 37%- roughly a 37 times improvement. (In the pre-politically correct literature this model was called "The Sultan's Dowry Problem," or "The Secretary Problem"; now, alas, it is usually called simply an example of an "Optimal Stopping Problem." )

Is this a good model for how we behave? Is this a strategy that one can realistically adopt? Certainly, 100 possibilities seems like a lot of choices to have if one is not the current day equivalent of a sultan -- a movie star or an athlete. But the model is intriguing, if not totally realistic and applicable.

Models that spring from modification of the rules of the Sultan problem have always been one of my favorites in this area. This makes Chapter 3 my favorite chapter: it is chock full of goodies with lots of interesting variations of the original problem, and thus even more interesting models. Some may be far more applicable. For example, if you get to play the cad and can keep potential mates 'stockpiled,' then, by stockpiling seven potential mates, there's a strategy that you can use to increase the odds of finding the best one to 96% or so! Or, in another variation of the model, whose solution she refers to as the "twelve bonk rule," there's a result that says that if you simply want to ensure that your choice is better than 90% of the other choices available, simply 'sample' the first 12 possibilities and pick the first person who is better after the first 12. This strategy gives you a 77% possibility of success.

I obviously can't go over all the models she builds, the interesting results she cites, or the interesting observations she makes in a review so let me simply give you some of the high points of the remaining chapters:

Chapter 1 is entitled "Love, sweeeet love" and mostly consists of showing you various differential equations that can model love's attraction and repulsion i.e. variations on standard "prey-predator models." For example, she mentions the following model of attraction:

"The more Romeo loves Juliet, the More Juliet wants to run away ... Romeo gets discouraged and backs off, Juliet finds him strangely attractive. Romeo tends to echo her..."

This model gives rise to a standard and very simple first order differential equation. She then talks about more sophisticated versions of this model including one by Rinaldi that tries to model a famous love poem by Petrarch. (Personally, I think these models are only useful for learning differential equations but don't shed much light on the problem.)

Chapter 2 is called "Marriage and the Happily Ever After" and describes models for behavior in a relationship, including an analysis of how absurd the folk tale is that more sex occurs in the first year of marriage then in all subsequent years combined. Probably the most interesting work she talks about in this chapter are the models by Guttman et al. intended to analyze conversations between lovers to determine if the relationship is on the rocks. In this case the models they build are known to be highly accurate in predicting problems in the relationship.

Chapter 4 is entitled "Dating Services -- are you really being served?" and it has a fascinating analysis of the perils of questionnaires that try to match too many variables (i.e. why those questionnaires don't help that much). As she points out, this is called the "curse of dimensionality" in the literature. The problem is that if you are trying to determine whether two points are very close in n-dimensional space where n is large, you are unlikely to get a whole lot of difference between points and so closeness doesn't really matter much.

Chapter 5 is called "Pairing Up," and shows how Game Theory can (should?) enter into the problem of "choice" preferences. This chapter is a very nice gateway into models that are studied in the greatest depth in economics; there is an incredibly interesting literature on these issues. One should start with Arrow's paradox on voting (that most logical axiom systems for building choice models are actually inconsistent and can't simultaneously be satisfied) and then work up to real problems with how congressional seats are allocated in the United States. Wikipedia has good articles to start with on these models.

Chapter 6 is called "Action Reaction Attraction" and is about ways to model people's attractiveness. This means things like symmetry as a cross cultural model for beauty, and waist-to-hip ratio for females as a cross-cultural model for male choice. Whether these models are correct is an extremely active area of research in anthropology and evolutionary psychology. The jury seems to still be out, but the evidence for their truth is certainly growing.

Chapter 7 is called "Pick a Sex, Any Sex" and is a tantalizing hint of what the mathematics of evolution is all about. In particular this chapter includes a nice discussion of how sex itself can evolve. (It seems paradoxical that the question of how sex itself can evolve is not yet resolved. After all, in a naive "selfish gene" approach to evolution, it would seem seem that asexual methods of reproduction win hands down. But, as usual, the issues are more complex then naive models would predict. For example, who would have thought that parasites might be the reason sex arose? Again, for more details on the science behind the models the author discusses, you can start with a useful Wikipedia article. Ridley's popular science book called the Red Queen (or anything by Maynard Smith) is where to go next.

Chapter 8 is titled "How Ovaries Count and Balls Add Up," and is about models for feedback levels of hormone concentration and circadian rhythms and didn't particular interest me.

Finally, Chapter 9 is called "Orgasm" and I'm not going to summarize it, since that would be telling.

To sum up, is this book perfect? No. I think more mathematically literate people would like appendices which give some indication of the deeper math behind what she discusses. For example, the math that shows why the answer I gave above to the Sultan's choice problem really is approximately 36.787944117144235 - or more correctly n/e, where e is the base of natural logarithms and n is the number of choices one has to go through, is well within the reach of any 2nd year calculus student. The differential equations she introduces in other chapters can be understood by anyone with a good engineering or math background. The game theory and even a proof of Arrow's theorem should be accessible to any literate person etc. As is, though, anyone with even some knowledge of or interest in mathematics will find this book great fun.

You can purchase Mathematics and Sex from bn.com. Slashdot welcomes readers' book reviews -- to see your own review here, read the book review guidelines, then visit the submission page.

rlandmann writes "John Patrick Ennis, whose nutty predictions as Sollog (Son of Light, Light of God) are familiar to many usenetters, may have bitten off more than he could chew when he picked Wikipedia as his latest vehicle for spamvertising." Click through for the rest of rlandmann's story.

Early last week an anonymous editor with a posting style remarkably like the one widely believed to be that of Sollog himself contributed this article to the encyclopedia, boasting of Sollog's prophesizing prowess and mathematical genius. Less than twenty-four hours later, the article was looking a little more balanced and encyclopedic. Along with Sollog's claims, it now carried the revelation that not everyone is as convinced of the accuracy of Sollog's power of prediction as he himself is, along with links to some rather unflattering appraisals of his work.

A week of spectacular net.kookery has since transpired, replete with vandalism of the article, bizarre legal threats, long semi-coherent rants with LOTS OF CAPITAL LETTERS, a rich bounty of links to Ennis-run sites, and a legion of anonymous posters with exactly the same writing style as one another all strenuously affirming that they are individual and distinct "fans" of Sollog and not the man himself. Unable to accept that Wikipedia's policy of presenting a Neutral Point of View means that an article on Sollog would have to include both pro- and anti-Sollog material, and unable to force other Wikipedia editors to accept his version of reality, Ennis has taken instead to making hostile phone calls to Wikipedia founder Jimmy Wales at his home, and setting up his very own Wikipedia and Wales hate site.

Whether or not Sollog really did predict Princess Diana's death, the Oklahoma bombing, 9/11, the crash of TWA flight 800, the Space Shuttle Columbia disaster, and most of the natural disasters in the US over the last few years, he doesn't seem to have foreseen his inability to control the picture that Wikipedia presents of him to the world.

See here for the current revision of the article, which may or may not be currently in a vandalized state.

rlandmann writes "John Patrick Ennis, whose nutty predictions as Sollog (Son of Light, Light of God) are familiar to many usenetters, may have bitten off more than he could chew when he picked Wikipedia as his latest vehicle for spamvertising." Click through for the rest of rlandmann's story.

Early last week an anonymous editor with a posting style remarkably like the one widely believed to be that of Sollog himself contributed this article to the encyclopedia, boasting of Sollog's prophesizing prowess and mathematical genius. Less than twenty-four hours later, the article was looking a little more balanced and encyclopedic. Along with Sollog's claims, it now carried the revelation that not everyone is as convinced of the accuracy of Sollog's power of prediction as he himself is, along with links to some rather unflattering appraisals of his work.

A week of spectacular net.kookery has since transpired, replete with vandalism of the article, bizarre legal threats, long semi-coherent rants with LOTS OF CAPITAL LETTERS, a rich bounty of links to Ennis-run sites, and a legion of anonymous posters with exactly the same writing style as one another all strenuously affirming that they are individual and distinct "fans" of Sollog and not the man himself. Unable to accept that Wikipedia's policy of presenting a Neutral Point of View means that an article on Sollog would have to include both pro- and anti-Sollog material, and unable to force other Wikipedia editors to accept his version of reality, Ennis has taken instead to making hostile phone calls to Wikipedia founder Jimmy Wales at his home, and setting up his very own Wikipedia and Wales hate site.

Whether or not Sollog really did predict Princess Diana's death, the Oklahoma bombing, 9/11, the crash of TWA flight 800, the Space Shuttle Columbia disaster, and most of the natural disasters in the US over the last few years, he doesn't seem to have foreseen his inability to control the picture that Wikipedia presents of him to the world.

See here for the current revision of the article, which may or may not be currently in a vandalized state.

rlandmann writes "John Patrick Ennis, whose nutty predictions as Sollog (Son of Light, Light of God) are familiar to many usenetters, may have bitten off more than he could chew when he picked Wikipedia as his latest vehicle for spamvertising." Click through for the rest of rlandmann's story.

Early last week an anonymous editor with a posting style remarkably like the one widely believed to be that of Sollog himself contributed this article to the encyclopedia, boasting of Sollog's prophesizing prowess and mathematical genius. Less than twenty-four hours later, the article was looking a little more balanced and encyclopedic. Along with Sollog's claims, it now carried the revelation that not everyone is as convinced of the accuracy of Sollog's power of prediction as he himself is, along with links to some rather unflattering appraisals of his work.

A week of spectacular net.kookery has since transpired, replete with vandalism of the article, bizarre legal threats, long semi-coherent rants with LOTS OF CAPITAL LETTERS, a rich bounty of links to Ennis-run sites, and a legion of anonymous posters with exactly the same writing style as one another all strenuously affirming that they are individual and distinct "fans" of Sollog and not the man himself. Unable to accept that Wikipedia's policy of presenting a Neutral Point of View means that an article on Sollog would have to include both pro- and anti-Sollog material, and unable to force other Wikipedia editors to accept his version of reality, Ennis has taken instead to making hostile phone calls to Wikipedia founder Jimmy Wales at his home, and setting up his very own Wikipedia and Wales hate site.

Whether or not Sollog really did predict Princess Diana's death, the Oklahoma bombing, 9/11, the crash of TWA flight 800, the Space Shuttle Columbia disaster, and most of the natural disasters in the US over the last few years, he doesn't seem to have foreseen his inability to control the picture that Wikipedia presents of him to the world.

See here for the current revision of the article, which may or may not be currently in a vandalized state.

rlandmann writes "John Patrick Ennis, whose nutty predictions as Sollog (Son of Light, Light of God) are familiar to many usenetters, may have bitten off more than he could chew when he picked Wikipedia as his latest vehicle for spamvertising." Click through for the rest of rlandmann's story.

Early last week an anonymous editor with a posting style remarkably like the one widely believed to be that of Sollog himself contributed this article to the encyclopedia, boasting of Sollog's prophesizing prowess and mathematical genius. Less than twenty-four hours later, the article was looking a little more balanced and encyclopedic. Along with Sollog's claims, it now carried the revelation that not everyone is as convinced of the accuracy of Sollog's power of prediction as he himself is, along with links to some rather unflattering appraisals of his work.

A week of spectacular net.kookery has since transpired, replete with vandalism of the article, bizarre legal threats, long semi-coherent rants with LOTS OF CAPITAL LETTERS, a rich bounty of links to Ennis-run sites, and a legion of anonymous posters with exactly the same writing style as one another all strenuously affirming that they are individual and distinct "fans" of Sollog and not the man himself. Unable to accept that Wikipedia's policy of presenting a Neutral Point of View means that an article on Sollog would have to include both pro- and anti-Sollog material, and unable to force other Wikipedia editors to accept his version of reality, Ennis has taken instead to making hostile phone calls to Wikipedia founder Jimmy Wales at his home, and setting up his very own Wikipedia and Wales hate site.

Whether or not Sollog really did predict Princess Diana's death, the Oklahoma bombing, 9/11, the crash of TWA flight 800, the Space Shuttle Columbia disaster, and most of the natural disasters in the US over the last few years, he doesn't seem to have foreseen his inability to control the picture that Wikipedia presents of him to the world.

See here for the current revision of the article, which may or may not be currently in a vandalized state.

rlandmann writes "John Patrick Ennis, whose nutty predictions as Sollog (Son of Light, Light of God) are familiar to many usenetters, may have bitten off more than he could chew when he picked Wikipedia as his latest vehicle for spamvertising." Click through for the rest of rlandmann's story.

Early last week an anonymous editor with a posting style remarkably like the one widely believed to be that of Sollog himself contributed this article to the encyclopedia, boasting of Sollog's prophesizing prowess and mathematical genius. Less than twenty-four hours later, the article was looking a little more balanced and encyclopedic. Along with Sollog's claims, it now carried the revelation that not everyone is as convinced of the accuracy of Sollog's power of prediction as he himself is, along with links to some rather unflattering appraisals of his work.

A week of spectacular net.kookery has since transpired, replete with vandalism of the article, bizarre legal threats, long semi-coherent rants with LOTS OF CAPITAL LETTERS, a rich bounty of links to Ennis-run sites, and a legion of anonymous posters with exactly the same writing style as one another all strenuously affirming that they are individual and distinct "fans" of Sollog and not the man himself. Unable to accept that Wikipedia's policy of presenting a Neutral Point of View means that an article on Sollog would have to include both pro- and anti-Sollog material, and unable to force other Wikipedia editors to accept his version of reality, Ennis has taken instead to making hostile phone calls to Wikipedia founder Jimmy Wales at his home, and setting up his very own Wikipedia and Wales hate site.

Whether or not Sollog really did predict Princess Diana's death, the Oklahoma bombing, 9/11, the crash of TWA flight 800, the Space Shuttle Columbia disaster, and most of the natural disasters in the US over the last few years, he doesn't seem to have foreseen his inability to control the picture that Wikipedia presents of him to the world.

See here for the current revision of the article, which may or may not be currently in a vandalized state.

morrison writes "A little over four years after moving to SourceForge at a current rate of several hundred downloads every day, BZFlag has finally "gone platinum". With over 1,000,000 SourceForge downloads, BZFlag looks to be the third game (following Tux Racer and StepMania) to go 'sf platinum'. While this doesn't include the many tens of thousands distributed prior to the project's migration to sf.net during the SGI days, it's a momentous occasion for open source gaming regardless."

jg21 writes "Although this reader-compiled list of software development's giants omits pioneers like George Boole, John Louis von Neumann, and the 'Forgotten Father of the Computer' John Vincent Atanasoff - among others - it does a pretty good job of mapping the Code Masters, from Alan Turing who gave us the algorithm, to Klaus Knopper the one-man band behind Knoppix. They're mostly here - the inventors of C, C++, C#, Java, and Python; example. There are a couple of programmers who have snuck in more for their business acumen than their programming talent, like the former Powersoft/Sybase CEO Mitchell Kertzman but otherwise the 40 nominees seem pretty 'pure' and the overall idea is to narrow the list down to the Top Twenty Software People in the World - a phrase invented by Tim Bray, who blogged that Adam Bosworth would be among them. Be careful what you wish for when blogging - looks like Bray's about to find out who the community thinks the the 19 others are."

Motor writes with the review below of Frederik Pohl's The Boy Who Would Live Forever, a series book which he says escapes the release-early, release-often approach of some series. Read on for his take on the book. The boy who would live forever: A novel of Gateway author Frederik Pohl pages 384 publisher Tor Books rating 8/10 reviewer Motor ISBN 076531049X summary The latest Gateway novel The Boy Who Would Live Forever is a Gateway novel. I am sure a big proportion of Slashdot readers need no introduction to Frederik Pohl's Gateway universe. But here goes:

The original novel Gateway, published in 1976, was a Hugo and Nebula award winner and quickly burned itself into the memory of many SF readers. It told the story of the discovery of an asteroid full of alien (the Heechee) ships. The ships are completely functional, but with no way to decode the navigation controls the only possible trips are... well... mysterious. Desperate prospectors from a poverty- and famine-stricken Earth travel to the Gateway asteroid (as it becomes known) to take a trip in a Heechee ship hoping to find something unusual, and perhaps earn themselves a share in the Gateway Corporation. Some never return; some return only after their food and oxygen has long run out; some are sent to destinations that kill the occupants of the craft; a lucky few return to enormous wealth. Later books in the series expanded on the premise and the reasons why the Heechee abandoned many of their vessels and tunnels and vanished.

The Boy Who Would Live Forever is the sixth book in the series. The word 'series' stirs up thoughts of those interminable fantasy or SF series that are pumped out at regular intervals for cash. Gateway books, on the other hand, are pretty rare things:

• Gateway (1976)
• Beyond the Blue Event Horizon (1980)
• Heechee Rendezvous (1984)
• Annals of the Heechee (1987)
• The Gateway Trip (1990)
• The Boy Who Would Live Forever: A Novel of Gateway (2004)

So a new one is something to look forward to -- at least for me.

The Boy Who Would Live Forever (TBWWLF) begins with the story of Stan, a young man growing up virtually penniless in Istanbul. After his father dies he inherits a life insurance payoff that is just enough to take him and a friend to Gateway. Unfortunately Stan's long-awaited first trip in a Heechee ship comes to nothing. Even worse, he returns to Gateway to find that the secret of Heechee ship navigation has been cracked. No more wild rides into the unknown... and no more big payoffs. But Stan somehow finds himself on a Gateway trip that will make him one of the first humans to find the elusive Heechee.

Other narrative threads involve Gelle-Klara Moynlin: a character from previous books who spent time trapped and frozen in time at the event horizon of a black hole. Marc Anthony: an artificial intelligence, Gourmet cook, and numerous other talents besides. Wan: a rich spoiled psychotic who grew up on a Heechee artifact (the child of stranded Gateway prospectors) and his attempt to get get hold of a weapon capable of destroying a star. Sigfried von Shrink: the A.I psychotherapist from the first Gateway novel makes a repeat appearance. That rarest of things, a mentally unstable Heechee: made that way, unsurprisingly, by having to live with humans. And more details on the Kugels -- or "The Foe" as the Heechee call them -- a race of energy creatures hell-bent on eliminating organic intelligences.

Like most of Pohl's work, TBWWLF has plenty of humour and insight. Cultural misunderstandings between the amiable Heechee and the slightly clueless Stan provide plenty of opportunity for sly jokes, and Wan's obsession with getting back "his" Old Ones (the Australopithecus pre-humans he grew up with on the Heechee artifact) and their lack of personal hygiene are played for a few gags.

Despite being a novel, TBWWLF has been constructed from a number of short stories ("From Istanbul to the Stars", "In the Steps of Heroes", "A Home for the Old Ones", "Hatching the Phoenix") with original material added to tie them together. This is the cause of its only major fault: it is quite disjointed. Some of that is inevitable given that a big chunk part of the novel takes place within a black hole. But even allowing for the difficulties of stitching together a story from threads crossing a time dilation of 40,000:1... in which some of your characters only experience a week or two while others experience a thousands years... the novel still does not hold together satisfactorily as a story. There are entire chapters devoted to a faster-than-light trip to watch the Crab Nebula supernova occur and see the occupants of a planet of that system in its final days. Fascinating it may be (and it is), but it never really feels like part of the novel. The varied threads do eventually come together to provide a conclusion of sorts, but taken as a whole the book is really more of a tour of the Gateway universe.

However, I don't want to give the impression that this is a bad thing. Anyone familiar with the earlier books will find plenty to enjoy. Much of TBWWLF is concerned with filling in the gaps left by previous books -- such as telling the story of humanity's first contact with the Heechee, and some of the religious implications of machine storing humans when their organic bodies run out. New readers, though, might find themselves a bit lost among all the A.Is, downloaded humans, prayer fans, Ones, Twos and Fives.

The Boy Who Would Live Forever does have its faults as a novel, but it is a genuinely enjoyable read and it is a welcome addition to the Gateway series. One can only hope that Pohl is able to continue it.

You can purchase the Boy Who Would Live Forever from bn.com. Slashdot welcomes readers' book reviews -- to see your own review here, read the book review guidelines, then visit the submission page.

Motor writes with the review below of Frederik Pohl's The Boy Who Would Live Forever, a series book which he says escapes the release-early, release-often approach of some series. Read on for his take on the book. The boy who would live forever: A novel of Gateway author Frederik Pohl pages 384 publisher Tor Books rating 8/10 reviewer Motor ISBN 076531049X summary The latest Gateway novel The Boy Who Would Live Forever is a Gateway novel. I am sure a big proportion of Slashdot readers need no introduction to Frederik Pohl's Gateway universe. But here goes:

The original novel Gateway, published in 1976, was a Hugo and Nebula award winner and quickly burned itself into the memory of many SF readers. It told the story of the discovery of an asteroid full of alien (the Heechee) ships. The ships are completely functional, but with no way to decode the navigation controls the only possible trips are... well... mysterious. Desperate prospectors from a poverty- and famine-stricken Earth travel to the Gateway asteroid (as it becomes known) to take a trip in a Heechee ship hoping to find something unusual, and perhaps earn themselves a share in the Gateway Corporation. Some never return; some return only after their food and oxygen has long run out; some are sent to destinations that kill the occupants of the craft; a lucky few return to enormous wealth. Later books in the series expanded on the premise and the reasons why the Heechee abandoned many of their vessels and tunnels and vanished.

The Boy Who Would Live Forever is the sixth book in the series. The word 'series' stirs up thoughts of those interminable fantasy or SF series that are pumped out at regular intervals for cash. Gateway books, on the other hand, are pretty rare things:

• Gateway (1976)
• Beyond the Blue Event Horizon (1980)
• Heechee Rendezvous (1984)
• Annals of the Heechee (1987)
• The Gateway Trip (1990)
• The Boy Who Would Live Forever: A Novel of Gateway (2004)

So a new one is something to look forward to -- at least for me.

The Boy Who Would Live Forever (TBWWLF) begins with the story of Stan, a young man growing up virtually penniless in Istanbul. After his father dies he inherits a life insurance payoff that is just enough to take him and a friend to Gateway. Unfortunately Stan's long-awaited first trip in a Heechee ship comes to nothing. Even worse, he returns to Gateway to find that the secret of Heechee ship navigation has been cracked. No more wild rides into the unknown... and no more big payoffs. But Stan somehow finds himself on a Gateway trip that will make him one of the first humans to find the elusive Heechee.

Other narrative threads involve Gelle-Klara Moynlin: a character from previous books who spent time trapped and frozen in time at the event horizon of a black hole. Marc Anthony: an artificial intelligence, Gourmet cook, and numerous other talents besides. Wan: a rich spoiled psychotic who grew up on a Heechee artifact (the child of stranded Gateway prospectors) and his attempt to get get hold of a weapon capable of destroying a star. Sigfried von Shrink: the A.I psychotherapist from the first Gateway novel makes a repeat appearance. That rarest of things, a mentally unstable Heechee: made that way, unsurprisingly, by having to live with humans. And more details on the Kugels -- or "The Foe" as the Heechee call them -- a race of energy creatures hell-bent on eliminating organic intelligences.

Like most of Pohl's work, TBWWLF has plenty of humour and insight. Cultural misunderstandings between the amiable Heechee and the slightly clueless Stan provide plenty of opportunity for sly jokes, and Wan's obsession with getting back "his" Old Ones (the Australopithecus pre-humans he grew up with on the Heechee artifact) and their lack of personal hygiene are played for a few gags.

Despite being a novel, TBWWLF has been constructed from a number of short stories ("From Istanbul to the Stars", "In the Steps of Heroes", "A Home for the Old Ones", "Hatching the Phoenix") with original material added to tie them together. This is the cause of its only major fault: it is quite disjointed. Some of that is inevitable given that a big chunk part of the novel takes place within a black hole. But even allowing for the difficulties of stitching together a story from threads crossing a time dilation of 40,000:1... in which some of your characters only experience a week or two while others experience a thousands years... the novel still does not hold together satisfactorily as a story. There are entire chapters devoted to a faster-than-light trip to watch the Crab Nebula supernova occur and see the occupants of a planet of that system in its final days. Fascinating it may be (and it is), but it never really feels like part of the novel. The varied threads do eventually come together to provide a conclusion of sorts, but taken as a whole the book is really more of a tour of the Gateway universe.

However, I don't want to give the impression that this is a bad thing. Anyone familiar with the earlier books will find plenty to enjoy. Much of TBWWLF is concerned with filling in the gaps left by previous books -- such as telling the story of humanity's first contact with the Heechee, and some of the religious implications of machine storing humans when their organic bodies run out. New readers, though, might find themselves a bit lost among all the A.Is, downloaded humans, prayer fans, Ones, Twos and Fives.

The Boy Who Would Live Forever does have its faults as a novel, but it is a genuinely enjoyable read and it is a welcome addition to the Gateway series. One can only hope that Pohl is able to continue it.

You can purchase the Boy Who Would Live Forever from bn.com. Slashdot welcomes readers' book reviews -- to see your own review here, read the book review guidelines, then visit the submission page.

superfebs writes "While Planeshift, the free (yes, as in Freedom, who cares otherwise) 3D MMORPG, is moving towards the 0.3 version, which will provide combat (read: flows of fresh blood), the current release has been ported to Mac OS X. Now more people can enjoy going around in a fantasy world chatting with others and collecting crystals. Oh, beta testers are needed."

pamri writes "The Times of India profiles Jay Patel, of Abika, a firm that specializes in background checks, personality profiles, satellite or aerial Photos of any location besides other services in the US. It is now venturing into other countries including Canada and India. Abika is already facing protests from Canadian Privacy groups for breaching the Canadian Personal Information Protection and Electronic Documents Act"

Eloquence writes "The Wikimedia Foundation, which operates Wikipedia and other wiki-based projects, has just launched the English and German editions of Wikinews, a free news-source created collaboratively by volunteers around the planet. See my article Wikinews and the Growing Wikimedia Empire for more on this and other recent developments in the Wikimedia world."

pluke writes "ComputerandVideoGames.com reports that today is the 10 year anniversary of the PlayStation launch in Japan. Facing stiff competition from the already entrenched Sega Saturn it went on to conquer the market and define the modern games industry. Happy Birthday old boy, though I must confess was always a Saturn man." Sniff...so many memories.

pluke writes "ComputerandVideoGames.com reports that today is the 10 year anniversary of the PlayStation launch in Japan. Facing stiff competition from the already entrenched Sega Saturn it went on to conquer the market and define the modern games industry. Happy Birthday old boy, though I must confess was always a Saturn man." Sniff...so many memories.

On December 3, 1984, a chemical plant run by Union Carbide and located in Bhopal, India released about 40 tons of a toxic gas which was an intermediate chemical used in creating pesticides. (That is, the plant was in the business of creating chemicals deadly to life.) Safety at the plant had not been a concern of management; numerous safety systems were offline or non-functional. The gas cloud drifted over the city and killed thousands of people, and inflicted permanent injury to hundreds of thousands more. It was the worst industrial accident to date. Today, the site remains a contaminated wasteland, unusable and never cleaned up. The survivors have been minimally compensated, but as time passes, enough of them have died that compensation may now be in the works. Update: 12/03 15:51 GMT by M : Whoops, just kidding, the Reuters story linked there is wrong; the BBC was apparently hoaxed into putting a Dow spokesman on TV who wasn't actually a Dow spokesman. Dow has no plans to clean up the facility and no plans to compensate the survivors. Hope this clears things up.