The MAC address is stored down at the ethernet frame level. The UDP checksum only covers the UDP header, it won't change due to changes at the ethernet frame level. That said, the UDP checksum is notoriously weak and relying on it at all is just asking for failure.
Interestingly enough, the only way I'll use IPv6 at home is if my ISP offers it. I have no interest in trying to set up complicated tunnels on my dynamic home link.
Caching is very useful in space. What happens when your satellite orbits around to the other side of Mars? You have several hours of no-communication and have to store everything you were going to send (and people on the other end have to store what they were going to send to you).
The trick is that you don't have to use TCP as your transport layer. DTN bundles can be transmitted over UDP, NORM, sneakernet, carrier pigeon, or anything else you can write a convergence layer for. Since DTN abstracts away the lower levels, each hop can use the transport layer that is most appropriate, like TCP on an internet hop, SCPS on a satellite hop, etc...
More information is available on the DTN Research Group's homepage: http://dtnrg.org.
If Edward 'Eddie' Davidson wants to live in a mountain cave in Pakistan for the rest of his life, I don't think I'd stop him. At least it would keep him away from computers.
Yeah, I can remember being told when I was growing up (back in the early 90s!) that phosphorous was directly linked to explosive growth of blue-green algae, which would choke out all other life in a body of water by sucking all of the free O2 out of it.
I'm guessing that this is a case of a scientist finally nailing down the exact biological process for something we've already known--we knew that phosphorous caused algae to grow, but we didn't know why exactly.
That also combines with the boat scene, which is how the Joker is defeated in this film. Having neither boat explode was the one thing he didn't expect. Granted, he planned for it of course, but by that point he was already defeated.
Re:Ledger doesn't deserve it for this.
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Batman Discussion
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I'm confused, you're saying it's not Academy Award level acting because there was action in the film? I don't understand how Anthony Hopkins could win for Silence of the Lambs, but Heath Ledger won't even be considered for his role as the Joker?
Re:S-laughter is the best medicine
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Batman Discussion
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I don't even have Satellite Radio, just the HD receiver that doesn't work very well at all. Granted, I live in the suburbs, several miles away from the transmitters, but of all of the HD radio stations I know about in the area, virtually none of them can be tuned reliably unless the weather conditions are just right.
The downside is of course that while Satellite radio works everywhere, HD radio only works if you're within 50 feet of the transmitter. I live in an area theoretically covered in HD channels, but actually pulling any of them in reliably requires a substantial antenna and a very good tuner.
I really think the FCC screwed the pooch by giving Ibiquity a monopoly on HD radio with their halfassed system. Now you can pay a licensing fee to build the receiver for a service that barely works at all. I was originally excited about HD radio too because I thought it would be like Digital TV, where you can distribute a crystal clear picture out to where the channel would normally get a bit fuzzy and deal more elegantly with having channels directly adjacent to yours (a big problem around here, where sometimes stations will have stations on either side of the dial and most radio receivers will end up mixing your signal with the adjacent ones randomly when you're driving down the road). Instead we have a system where you practically never get an HD lock.
Heck, what if you were in the car business and someone else made a car that could drive on the same roads as yours? (oh no, a car analogy!) Heck, I'm sure every first mover in every industry would just love to sue any upstarts out of business.
The tricky part is finding a way to combine the elements in such a way that they can't be broken down to the constituent parts, because as soon as you can do that you're back to where you started.
I can't wait until someone's daughter tries to make an account on Barbie's Horse Talk website and is presented with the following CAPTCHA:
Prove that a 3-manifold space has the additional property that each loop in the space can be continuously tightened to a point then it is just a three-dimensional sphere.
You're talking about something even more expensive though: A base with some sort of nontrivial manufacturing ability. You've glossed over where you're going to get those raw materials as well, if you're doing it from an asteroid you capture then you have to have a refining capacity on the station as well (not to mention the ability to refine a LOT of different mineral types in your space station--a telescope probe alone would require the ability to manufacture high precision lenses, propellants, batteries, computer parts, not to mention the frame itself). Chances are you wouldn't be able to do all of that realistically and you'd have to ship most of the raw materials up from Earth, but if you're doing that you might as well just manufacture the thing on Earth and launch it from there. No point in making a rendezvous with your orbital moon base.
Maybe if you had some sort of big mass driver to reduce the amount of propellant needed to get the satellites started on their journey, but you could put that in Earth orbit and save a lot on the logistics costs of getting stuff into a lunar orbit.
The problem is that to set up that CAPTCHA you have to have a person sift through a huge picture archive of cats and dogs and mark each one. However, that limits the size of your CAPTCHA dictionary to however many entries a person can parse in a reasonable amount of time. This means the bad guys can sit down a person (or two, or ten) and go through all of your images to seed a database with the correct answers for their bots.
Computers are pretty good at math last time I checked. Asking for something that would require a full on AI to answer is good (the hair color part), but the problem is that it requires a human to seed the questions, which means they will be limited in number. If they're limited in number then the spammers will just go through and keep reloading the screen until they've seen all (or mostly all) of the answers and program their bot with the correct answers.
CAPTCHAs need to be able to be generated algorithmically by a computer, but not answered by one, which is a surprisingly difficult problem. Anything that requires human intervention on the creation of each variation is doomed to fail because spammers have more free time than you do.
Don't remind me. I have the same laptop at work and it actually has a smaller screen than the D610 it replaced. I hate the screen on it because it's just slightly too short for stuff like 80x50 putty terminals (at max height it only gets to 80x49!). The worst part is that it's a "widescreen" that they made by taking a very reasonable 4:3 screen (1280x1024 on the D610) and just cutting off pixels from the bottom. Now it's a pain in the rear to get dual mirrored displays working with our projectors (which are native 1280x1024 and don't like widescreen formats). If I were buying a laptop for my personal use I'd never get the D630 (not even counting the fact that it's marketed as a business machine) thanks to the display.
Really, a vehicle designed to orbit the moon needs a lot of things the current ISS is not designed to provide, like cosmic ray protection (no Van Allen belts on the moon!), greatly improved recycling facilites, and in general would have to be a lot more autonomous than the ISS currently is. Trying to rebuild the ISS to be all of that is almost certainly more work than building a whole new vehicle from scratch, if only because you'd have to do all of the work on the ISS while keeping it habitable by people.
Frankly, any way you attempt this it is going to be astronomically expensive and of limited scientific use (the ISS already suffers from this problem). A more reasonable solution in my opinion is an actual moon base on the surface of the moon. At least there you can do a bunch of geological studies and could theoretically build underground to get around the cosmic ray problem. Also, you might even be able to find some usable water and minerals. The scientific utility is still pretty limited though, especially for the cost such an endeavor would require.
What kills me is that you're stuck with the crappy 1280x800 screen on every Macbook until you get to the outrageously expensive Macbook Pros. Even my >2 year old $600 Inspiron 6000 has a 1680x1050 display on it. I can't go back, but I don't want to pay $2,800 for a laptop either.
Actually, it's pointless for FPS style games. They'll never use even a GB of that memory effectively because the games are designed around people with 512MB at the high end. The only reason I see to buy this card is maybe there are drivers optimized for professional work where the memory requirements are much higher (3D modelers and the like).
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The MAC address is stored down at the ethernet frame level. The UDP checksum only covers the UDP header, it won't change due to changes at the ethernet frame level. That said, the UDP checksum is notoriously weak and relying on it at all is just asking for failure.
They must have had a 1000 years of space-Bush presidency.
Interestingly enough, the only way I'll use IPv6 at home is if my ISP offers it. I have no interest in trying to set up complicated tunnels on my dynamic home link.
Caching is very useful in space. What happens when your satellite orbits around to the other side of Mars? You have several hours of no-communication and have to store everything you were going to send (and people on the other end have to store what they were going to send to you).
The trick is that you don't have to use TCP as your transport layer. DTN bundles can be transmitted over UDP, NORM, sneakernet, carrier pigeon, or anything else you can write a convergence layer for. Since DTN abstracts away the lower levels, each hop can use the transport layer that is most appropriate, like TCP on an internet hop, SCPS on a satellite hop, etc...
More information is available on the DTN Research Group's homepage: http://dtnrg.org.
If Edward 'Eddie' Davidson wants to live in a mountain cave in Pakistan for the rest of his life, I don't think I'd stop him. At least it would keep him away from computers.
Yeah, I can remember being told when I was growing up (back in the early 90s!) that phosphorous was directly linked to explosive growth of blue-green algae, which would choke out all other life in a body of water by sucking all of the free O2 out of it.
I'm guessing that this is a case of a scientist finally nailing down the exact biological process for something we've already known--we knew that phosphorous caused algae to grow, but we didn't know why exactly.
That also combines with the boat scene, which is how the Joker is defeated in this film. Having neither boat explode was the one thing he didn't expect. Granted, he planned for it of course, but by that point he was already defeated.
I'm confused, you're saying it's not Academy Award level acting because there was action in the film? I don't understand how Anthony Hopkins could win for Silence of the Lambs, but Heath Ledger won't even be considered for his role as the Joker?
Who cares about the IMDB top 250?
I don't even have Satellite Radio, just the HD receiver that doesn't work very well at all. Granted, I live in the suburbs, several miles away from the transmitters, but of all of the HD radio stations I know about in the area, virtually none of them can be tuned reliably unless the weather conditions are just right.
The downside is of course that while Satellite radio works everywhere, HD radio only works if you're within 50 feet of the transmitter. I live in an area theoretically covered in HD channels, but actually pulling any of them in reliably requires a substantial antenna and a very good tuner.
I really think the FCC screwed the pooch by giving Ibiquity a monopoly on HD radio with their halfassed system. Now you can pay a licensing fee to build the receiver for a service that barely works at all. I was originally excited about HD radio too because I thought it would be like Digital TV, where you can distribute a crystal clear picture out to where the channel would normally get a bit fuzzy and deal more elegantly with having channels directly adjacent to yours (a big problem around here, where sometimes stations will have stations on either side of the dial and most radio receivers will end up mixing your signal with the adjacent ones randomly when you're driving down the road). Instead we have a system where you practically never get an HD lock.
New?
Heck, what if you were in the car business and someone else made a car that could drive on the same roads as yours? (oh no, a car analogy!) Heck, I'm sure every first mover in every industry would just love to sue any upstarts out of business.
I don't understand why we don't just write every EULA ever right into the constitution.
The tricky part is finding a way to combine the elements in such a way that they can't be broken down to the constituent parts, because as soon as you can do that you're back to where you started.
I can't wait until someone's daughter tries to make an account on Barbie's Horse Talk website and is presented with the following CAPTCHA:
Prove that a 3-manifold space has the additional property that each loop in the space can be continuously tightened to a point then it is just a three-dimensional sphere.
You're talking about something even more expensive though: A base with some sort of nontrivial manufacturing ability. You've glossed over where you're going to get those raw materials as well, if you're doing it from an asteroid you capture then you have to have a refining capacity on the station as well (not to mention the ability to refine a LOT of different mineral types in your space station--a telescope probe alone would require the ability to manufacture high precision lenses, propellants, batteries, computer parts, not to mention the frame itself). Chances are you wouldn't be able to do all of that realistically and you'd have to ship most of the raw materials up from Earth, but if you're doing that you might as well just manufacture the thing on Earth and launch it from there. No point in making a rendezvous with your orbital moon base.
Maybe if you had some sort of big mass driver to reduce the amount of propellant needed to get the satellites started on their journey, but you could put that in Earth orbit and save a lot on the logistics costs of getting stuff into a lunar orbit.
The problem is that to set up that CAPTCHA you have to have a person sift through a huge picture archive of cats and dogs and mark each one. However, that limits the size of your CAPTCHA dictionary to however many entries a person can parse in a reasonable amount of time. This means the bad guys can sit down a person (or two, or ten) and go through all of your images to seed a database with the correct answers for their bots.
Computers are pretty good at math last time I checked. Asking for something that would require a full on AI to answer is good (the hair color part), but the problem is that it requires a human to seed the questions, which means they will be limited in number. If they're limited in number then the spammers will just go through and keep reloading the screen until they've seen all (or mostly all) of the answers and program their bot with the correct answers.
CAPTCHAs need to be able to be generated algorithmically by a computer, but not answered by one, which is a surprisingly difficult problem. Anything that requires human intervention on the creation of each variation is doomed to fail because spammers have more free time than you do.
Don't remind me. I have the same laptop at work and it actually has a smaller screen than the D610 it replaced. I hate the screen on it because it's just slightly too short for stuff like 80x50 putty terminals (at max height it only gets to 80x49!). The worst part is that it's a "widescreen" that they made by taking a very reasonable 4:3 screen (1280x1024 on the D610) and just cutting off pixels from the bottom. Now it's a pain in the rear to get dual mirrored displays working with our projectors (which are native 1280x1024 and don't like widescreen formats). If I were buying a laptop for my personal use I'd never get the D630 (not even counting the fact that it's marketed as a business machine) thanks to the display.
Really, a vehicle designed to orbit the moon needs a lot of things the current ISS is not designed to provide, like cosmic ray protection (no Van Allen belts on the moon!), greatly improved recycling facilites, and in general would have to be a lot more autonomous than the ISS currently is. Trying to rebuild the ISS to be all of that is almost certainly more work than building a whole new vehicle from scratch, if only because you'd have to do all of the work on the ISS while keeping it habitable by people.
Frankly, any way you attempt this it is going to be astronomically expensive and of limited scientific use (the ISS already suffers from this problem). A more reasonable solution in my opinion is an actual moon base on the surface of the moon. At least there you can do a bunch of geological studies and could theoretically build underground to get around the cosmic ray problem. Also, you might even be able to find some usable water and minerals. The scientific utility is still pretty limited though, especially for the cost such an endeavor would require.
What kills me is that you're stuck with the crappy 1280x800 screen on every Macbook until you get to the outrageously expensive Macbook Pros. Even my >2 year old $600 Inspiron 6000 has a 1680x1050 display on it. I can't go back, but I don't want to pay $2,800 for a laptop either.
2009? If that's true color me shocked. I though it would take much longer.
Actually, it's pointless for FPS style games. They'll never use even a GB of that memory effectively because the games are designed around people with 512MB at the high end. The only reason I see to buy this card is maybe there are drivers optimized for professional work where the memory requirements are much higher (3D modelers and the like).