So, in order to be life, every molecule essential to the organism must have a corresponding chemical pathway?
By that standard, humans or any other animal can't be considered life... we need to eat all kinds of essential nutrients, like vitamins and certain amino acids, because we can't synthesize them.
I don't think I've heard "trunking" being used as "vlan tagging," but 802.1q is available via the vlan interface nonetheless. It's quite simple: just "man ifconfig" and "man vlan". The quality of the documentation, in particular the man pages, in OpenBSD was really refreshing when I started using it after coming from Linux.
Linux binary support under OpenBSD is surprisingly good; you might give that a whirl. Just install the port emulators/redhat, execute 'sysctl kern.emul.linux=1', and change/etc/sysctl.conf. Then use a Linux JRE.
Try changing your root password on 10 different servers on a regular basis.
Using LDAP to set root passwords is a horrible idea. Often, you need to login to a machine as root when something bad is happening, and that often entails network access being unavailable. This is an undesired dependency in most environments.
The people that pay for software will pay regardless of the license, and the people who pirate commercial software will find a 3rd party providing your GPL software for free.
When it comes to my money, I'm not going to spend it if I don't have to. I don't pirate, because it takes too much time, it's morally wrong, and there's a potential I could get sued. Most people and almost all businesses agree with me. That's how capitalism works.
The more important thing about writing software yourself is that you have the right to license it however you see fit. So, I can sell a version of software I've written with added features under a proprietary license that my GPL version lacks. Any old person hacking on the GPL version doesn't have the right to remove the GPL license and thus won't be able to turn a profit. You can almost use the GPL licensed stuff as a form of shareware -- a more stripped down version of the real stuff, which I've seen. And before you say that the GPL license allows you to sell the software, you'll never wind up getting enough money to pay the bills.
New traits to a species must occur in the germ line, the cells that are passed between generations, like sperm and eggs. Cancer typically is the result of somatic (non-germline) mutations. While somatic mutations can lead to possibly interesting traits, they won't result in traits inherited by progeny. So, while similar mechanisms underlie both the onset of cancer and the formation of new traits, they're not as intrinsically linked as you suggest them to be.
In cancerous cells, certain genes are more likely to be "turned on," which give the cancerous cells a selective advantage. What likely is happening in mice (of course I'm hypothesizing; the article says researchers are trying to determine this now) is that cells with these oncogenes (cancer causing genes) are recognized and destroyed.
ssh keys are less prone to mistakes because you're not doing everything manually if you've got several servers: under your scheme you need to manually ssh to each machine then manually run sudo to modify something. if you manage over 3 machines, this is a complete waste of time and makes you slow to respond. you can allow junior admins to have access to a specific subset of commands by sharing keys on a golden host. allowing the user's public key (or kerberos, preferably) can be used for full root access on certain machines. also, since when is revocation hard? you have to modify the authorized_keys file, which is just as much work as modifying the sudoers file. i fail to see the difference. also, you ignored the claim that having user directories mounted on servers is a bad idea in the event the server gets compromised: whoever compromised that machine now has your password, which is the only authentication token required to get root on other machines.
Sudo allows you to grant access to specific users for specific commands, and then revoke those commands later. Compare this with giving the root password to everyone, which requires the password to be changed whenever someone leaves the company (or someone's root privs are revoked).
I can grant access via sudo to users for specific commands, without giving them complete administrative access to the entire system.
ssh keys, or kerberos can give the same advantages. Allowing root password ssh logins is just stupid.
When I'm using 'sudo' to do things, my environment stays the same. This means that my $PATH variable stays the same, and so does my prompt. It means that any time I say ~ it refers to/home/myusername and not/root, meaning I can get to it later.
I can set in ~/.bash_profile that I want rm to use -i by default (alias rm='rm -i') for safety, which carries over into my 'sudo' environment; doing this for root by default can cause e.g. cronjobs to hang, waiting for input that will never come.
Yeah, except that frequently servers have some other environment than your typical desktop (different OS or whatever), so you might need to set unique environments for each. Also, I usually want my servers functioning effectively as islands: I don't want them to have access to home directories, because my servers are typically publicly facing and are more likely to be comprimised.
The benefits of sudo are not limited to 'gaining root' - they are multitudinous, and apparently your coworkers have never considered versatility to be a benefit; nor, for that matter, have they done likewise for security. Perhaps they should be educated.
I find the versitility of being able to change an arbitrary number of servers at once far more beneficial than having to manually login to each and modify the same config file or whatever by hand. Sudo's also been affected by a number of security problems recently, which tend to allow your carefully constructed ACL's to be bypassed. See http://www.courtesan.com/sudo/security.html .
It would be theoretically possible to create a certain protein which targets cell-specific division. Like cancer cells. It wouldn't eradicate the cancerous cells, but it would certainly slow or possibly stop the cells' replication.
The problem isn't finding something to stop cell division; there are proteins we can use right now to cause outright apoptosis (cell suicide). The real problem is in identification of cancer cells, which is a notoriously hard problem on a molecular basis: cancer is just an accumulation of random mutations that happen to be harmful to you, so it's difficult to differentiate between cancerous and regular cells. Even if there was a magic bullet for molecular identification of cancerous cells, it's unlikely you'll be treating that cell with enzymes because they're degraded rather quickly.
The idea is that we can use electricity to generate hydrogen, then store it. Electricity generated from a single coal power plant will produce far less pollution than gasoline from several million cars. Additionally, we're not running out of coal any time soon, and we wouldn't need to buy it from the middle east.
How is the existing periodic table not a gross oversimplification if this new one is?
This periodic table doesn't show relationships within the groups of elements cleanly, which is best done in a tabular form, instead of a linear spiral form. It also seems to be conveying the confused idea of chemicals being somehow distributed in a galaxy.
As far as I can tell, the new one(s) are entirely complete and accurate. Moreso, they actually are organized in a way that can be extended. The existing periodic table is only complete because of the footnotes, extensions and other non-obvious changes required to stuff all of that extra didn't-know-it-existed-at-the-time information into it.
What footnotes and extensions? Like adding a property stating the exact atomic radius or atomic weight? I have a periodic table that lists 8 properties for every element, but I really only use the periodic table for the atomic weights, since the other information I rarely use can easily look up with a computer.
The new one isn't only pretty, it's totally logical in an absolutely obvious way.
It's pretty because they put a galaxy in the backdrop? I guess if that's the case, I could make the old one sexy by putting a picture of a hot girl in the background or angry if a drew a picture of a face with eyebrows pointing towards the nose. It's not logical; chemically there's a huge difference between flourine and sodium, but this new periodic spiral doesn't effectively convey that. Hell, they even lined up hydrogen with carbon.
Indeed, I can't see any practicing engineer or scientist finding any use for this thing. It's also a bad idea for instruction, because it's a gross oversimplification of the distribution of the elements in the universe. The periodic table is useful, because it's complete and accurate, but this is not. There are already severalotherperiod tables with more instructional or historical value.
RTFM. sshd_config(5)
MaxAuthTries
Specifies the maximum number of authentication attempts permitted
per connection. Once the number of failures reaches half this
value, additional failures are logged. The default is 6.
Crackers will just open up more connections.
Any refactoring would be hopelessly limited. The GP was discussing an API change that would require a simultaneous change in both glibc and the kernel. This is unlikely in Linux for a few reasons:
Most real world environments upgrade kernels and other packages, such as glibc, at different times. With BSD, you could make such a change across releases, but with something like Debian, you would need to make such a transition smooth.
You would abandon any users who had vanilla kernels, since it would require a special patch, something most users aren't willing to do.
It's unlikely to even happen in the first place, since, at least in my experience, most packagers don't have developer-level knowledge of the package.
Such an API change is possible, yes, in theory but hopelessly limited in practice.
Re:freezing water
on
How Ice Melts
·
· Score: 3, Interesting
This is a particularly pervasive myth. Of course, the folklore is incorrect: according to basic thermodynamics, a quantity of warm water will invariably take longer to freeze than an equal quantity of cold water.
I hate to nitpick, but thermodynamics will not tell you that. The heat transfer details depend on the nature of the system, which is outside the scope of thermodynamics.
You could imagine two closed cylindrical containers, each initially filled with a substance in a liquid state. The liquid of container A is at a temperature such that the density is the minumum. The liquid in container B is initially at a higher temperature than container A. For simplicity's sake, the only extremum of density with respect to temperature is the minimum I mentioned. You begin cooling both liquids at the top of the cylinder.
As heat is transferred from container A, the density will always be increasing from the top to the bottom of the container in a predictable fashion, i.e., the "heavier" substances will always be on the bottom of the container. This doesn't promote convection. With container B, there are good opportunities for convection, due to the varying density gradient and the effect of gravity. Solid forming on the top of container B could even sink. The convection leads to a higher sustained temperature gradient at the cylinder boundary, leading to faster heat transfer and faster cooling.
Note that this mechanism doesn't require an open system. There are, of course, other possible mechanisms, but this is the simplest one I could come up with.
This is completely wrong. It sometimes gets tricky if the drug isn't completely specified, like if we're dealing with a product whose contents aren't completely specified, such as a beer or cellular extract. However, viagra and most contemporary pharmaceuticals are a combination of a few or one fully specified chemicals. You do need to put a synthetic pathway in the patent, but that isn't what prevents competitors from selling the drug.
Anyway, it's fairly trival to make organic chemicals through different processes. The real economic barrier is discovery and approval. Production is cheap. If what you suggested were true, the pharmaceutical industry would cease research into new drugs, because there would be no short term monopolies afforded by patents.
Slashdot Mirror
So, in order to be life, every molecule essential to the organism must have a corresponding chemical pathway? By that standard, humans or any other animal can't be considered life... we need to eat all kinds of essential nutrients, like vitamins and certain amino acids, because we can't synthesize them.
I don't think I've heard "trunking" being used as "vlan tagging," but 802.1q is available via the vlan interface nonetheless. It's quite simple: just "man ifconfig" and "man vlan". The quality of the documentation, in particular the man pages, in OpenBSD was really refreshing when I started using it after coming from Linux.
Linux binary support under OpenBSD is surprisingly good; you might give that a whirl. Just install the port emulators/redhat, execute 'sysctl kern.emul.linux=1', and change /etc/sysctl.conf. Then use a Linux JRE.
This is what happens when i don't preview. label:$foo is:unread
Search for label: is:unread
The more important thing about writing software yourself is that you have the right to license it however you see fit. So, I can sell a version of software I've written with added features under a proprietary license that my GPL version lacks. Any old person hacking on the GPL version doesn't have the right to remove the GPL license and thus won't be able to turn a profit. You can almost use the GPL licensed stuff as a form of shareware -- a more stripped down version of the real stuff, which I've seen. And before you say that the GPL license allows you to sell the software, you'll never wind up getting enough money to pay the bills.
In cancerous cells, certain genes are more likely to be "turned on," which give the cancerous cells a selective advantage. What likely is happening in mice (of course I'm hypothesizing; the article says researchers are trying to determine this now) is that cells with these oncogenes (cancer causing genes) are recognized and destroyed.
ssh keys are less prone to mistakes because you're not doing everything manually if you've got several servers: under your scheme you need to manually ssh to each machine then manually run sudo to modify something. if you manage over 3 machines, this is a complete waste of time and makes you slow to respond. you can allow junior admins to have access to a specific subset of commands by sharing keys on a golden host. allowing the user's public key (or kerberos, preferably) can be used for full root access on certain machines. also, since when is revocation hard? you have to modify the authorized_keys file, which is just as much work as modifying the sudoers file. i fail to see the difference. also, you ignored the claim that having user directories mounted on servers is a bad idea in the event the server gets compromised: whoever compromised that machine now has your password, which is the only authentication token required to get root on other machines.
~/.authorized_keys: command="/sbin/reboot" ssh-dss AAAAB3
The idea is that we can use electricity to generate hydrogen, then store it. Electricity generated from a single coal power plant will produce far less pollution than gasoline from several million cars. Additionally, we're not running out of coal any time soon, and we wouldn't need to buy it from the middle east.
See http://www.agi-usa.org/pubs/fb_teen_sex.html
Indeed, I can't see any practicing engineer or scientist finding any use for this thing. It's also a bad idea for instruction, because it's a gross oversimplification of the distribution of the elements in the universe. The periodic table is useful, because it's complete and accurate, but this is not. There are already several other period tables with more instructional or historical value.
RTFM. sshd_config(5) MaxAuthTries Specifies the maximum number of authentication attempts permitted per connection. Once the number of failures reaches half this value, additional failures are logged. The default is 6. Crackers will just open up more connections.
- Most real world environments upgrade kernels and other packages, such as glibc, at different times. With BSD, you could make such a change across releases, but with something like Debian, you would need to make such a transition smooth.
- You would abandon any users who had vanilla kernels, since it would require a special patch, something most users aren't willing to do.
- It's unlikely to even happen in the first place, since, at least in my experience, most packagers don't have developer-level knowledge of the package.
Such an API change is possible, yes, in theory but hopelessly limited in practice.You could imagine two closed cylindrical containers, each initially filled with a substance in a liquid state. The liquid of container A is at a temperature such that the density is the minumum. The liquid in container B is initially at a higher temperature than container A. For simplicity's sake, the only extremum of density with respect to temperature is the minimum I mentioned. You begin cooling both liquids at the top of the cylinder.
As heat is transferred from container A, the density will always be increasing from the top to the bottom of the container in a predictable fashion, i.e., the "heavier" substances will always be on the bottom of the container. This doesn't promote convection. With container B, there are good opportunities for convection, due to the varying density gradient and the effect of gravity. Solid forming on the top of container B could even sink. The convection leads to a higher sustained temperature gradient at the cylinder boundary, leading to faster heat transfer and faster cooling.
Note that this mechanism doesn't require an open system. There are, of course, other possible mechanisms, but this is the simplest one I could come up with.
Anyway, it's fairly trival to make organic chemicals through different processes. The real economic barrier is discovery and approval. Production is cheap. If what you suggested were true, the pharmaceutical industry would cease research into new drugs, because there would be no short term monopolies afforded by patents.
It was a bad vi joke. I didn't intend for it to be interpreted literally.