Samson said:
I am amazed that the chemistry text book does not mention it, my knowledge of it comes from my A-level chemistry, and I thought that covered the basics of it pretty well. What level are these books?
they are uni level books. The organic chem book doesn't go into it, the less specialised chem text probably does mention it, but I don't remember it going into much detail. I've just moved house, it's still in a box somewhere, so I didn't have it handy.
Basicly, entropy = change in disorder of a system. It can also be thought of as the number of degrees of freedom in the system, or (from [1]) "how much energy is spread out in a process, or how widely spread out it becomes at a specific temperature."
Yeah, I do know the basic stuff. The bit that's confusing me is trying to match up gravitational effects with an increase in entropy. It appears to me that gravity is something that makes things more ordered, and massively increasing the effect of gravity shouldn't change any universal laws, but should result in one big ball of stuff, which is even more ordered than the universe we currently have. So either I need a new definition for disorder and entropy, that shows forming planets and things does increase disorder, or the 2nd law is not a universal law applying to everything, but is actually an approximation to apply only to closed, thermodynamic systems, or I've missed something else entirely. The popular science books I have unpacked suggest option 2.
To keep vaguely on topic, it's like the phrase brought up in a definition a few posts ago, 'the law of natural selection'. It's not a universal law, it's something that applies only to systems that can experience cumulative selection. And my misunderstanding may be along the lines of people who look at 'survival of the fittest', 'law of the jungle', and say it's obviously crap, because wouldn't that result in one really powerful animal eating everything else? (I hope not, because I'll feel really stupid if it is.)
el machinae said:
Originally Posted by El_Machinae
How can this not be an evolutionary winner, if the DNA (exact DNA) is propagated and nurtured indefinitely? And all the people not smart enough to take anti-aging measures will have to try to continue to live through their children (if they have them).
One reason I can see is that te exact DNA is propagated indefinitely, the organisms based on it lose the ability to adapt. Evolution is built on not copying exactly. Not really a problem at the moment, as for the most part we're capable of adapting our environment instead. A lot of potential problems I can come up with get into the realms of speculative sci-fi stuff.
Personally, I have no interest in living indefinitely, it's something that really doesn't appeal to me. I can see lots of good reasons for researching this sort of stuff though. But the statement in your quote, and the idea of going from organisms that live 70 years or so to organisms that are practically immortal, suggests to me the mentality of "We are the absolute pinnacle of evolution, we want to freeze things now, as we're not going to get any better." That seems arrogant to me, there's no reason why humans as they are now are the pinnacle, there's no reason why keeping the current DNA as is in perpetuity is a good idea, unless we can do the same to the world. One practical example that springs to mind is disease resistance. Viruses will continue to evolve, new viruses will appear, especially as curing aging is likely to lead to humans expanding into new habitats. If viruses have a static population of people to evolve against, I can see them causing us a few problems.