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Rogan Josh
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quote: Originally posted by Mark L
Many scientists are backing away from the String theory now. Apparantly it wasn't as good as they hoped it would be, so they are busily working on a replacement.
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Try telling that to Ed Witten! String theory is very much alive and kicking! I am thinking about doing a little research that way myself next year.
It has been somewhat superceeded by a 'higher' theory called M-Theory in which the string theory is embedded but there are lots of people still working on strings.
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Urban Ranger
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Apolyton Duke of Off-Topic
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quote: Originally posted by Rogan Josh
Newtonian mechanics will give wrong predictions of physics at high speeds. It is wrong for describing this, but is a reasonable approximation to reality for low speeds. Likewise GR will give wrong predictions for small distance effects. It is wrong for describing this, but is a reasonable approximation at large distances scales. |
So we both agreed that theories are just approximations of nature, and they'll be progressively refined. Therefore, more descriptive theories - ones that can explain nature better, will replace older, less accurate ones.
IIRC though Newtonian physics was accurately enough at the turn of last century. No observations of physics at extreme speeds, enormous pressure, or infinitesimal distances were made - or even possible then.
quote: Originally posted by Rogan Josh
This is evidence for microevolution - not the evolution of man. |
Not direct evidence of speciation, but it clearly shows natural selection at work.When we don't have direct evidence of something, we look for indirect ones. Fossils of transitional species, for example, are very strong evidence for evolution and very strong evidence against creationism.
quote: Originally posted by Rogan Josh
The best tested theory we have is Quantum ElectroDynamics. This is an interesting point though. There are certainly different standards in different branches of science as to what constitutes 'well supported'. |
Mathematics doesn't work very well with evolution Statistics and such are used to as tools for data collection and analysis, not for direct derivation.
quote: Originally posted by Rogan Josh
I agree. Creationism isn't a nice theory from a scientific point of view (I certainly don't believe in it), because it is not predictive. But non-predictivity does not preclude something from being true. For example, look at the quantum mechanics. There are many interpretations of QM, two of which are The Copenhagen Interpretation and Everett's Many Worlds Interpretation. There is no experiment we can do to prove of disprove either of them, but that doesn't mean they are wrong. |
Some scientists are eager to point out that philosophical interpretations shouldn't be imposed on scientific theories
quote: Originally posted by Rogan Josh
Also, although creation cannot be proven wrong - it could be proven right. God could descend with His Host of Angles tomorrow morning, and then we would all know for sure. |
Then I'd in deep trouble 
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MORON
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Vancouver, Canada
Jun 2001 time: 13:16
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Creationism have less evidence than macroevolution.
Since no micro-creation has yet been seen.
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Rogan Josh
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quote: Originally posted by MORON
Creationism have less evidence than macroevolution.
Since no micro-creation has yet been seen. |
Funnily enough, this highlights one of the problems I have with evolution (although I stress that I still believe it is a better theory than creation).
We have never observed a creation of life event which was necessary in the primordial soup to set off evolution in the first place. Presumably it would have to be rather common-place since the chance of one tiny single celled organism turning into life on Earth without being killed off must be fairly high. There are always anthropic principles to fall back on I suppose....
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Guynemer
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quote: Originally posted by Rogan Josh
Funnily enough, this highlights one of the problems I have with evolution (although I stress that I still believe it is a better theory than creation).
We have never observed a creation of life event which was necessary in the primordial soup to set off evolution in the first place. Presumably it would have to be rather common-place since the chance of one tiny single celled organism turning into life on Earth without being killed off must be fairly high. There are always anthropic principles to fall back on I suppose.... |
On the other hand, there's aren't too many "primordial soup" like locales on the Earth anymore. Also, even if a life-creation event took place somewhere on Earth today (lets say around thermal vents), said organism would likely be outcompeted/eaten/destroyed/what-have-you by our established organisms.
In that regard, it was likely easier for the first lifeform to establish itself than it would be for a new one today. It wouldn't have had any competition.
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Roman
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Bratislava, Slovakia
Sep 2000 time: 05:16
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quote: Originally posted by chegitz guevara
Incorrect. This theory, which is known as Lysenkoism, was disprroved with a rather simple experiment. Generations of mice had their tails cut off, but at no point did mice ever evolve into hamsters.
The only place where changes in the body can affect future generations are in the germ cells in the testes/ovaries. No matter how much I exercise, I will not pass on good muscle tone to my kids. |
This is not quite true. If you exercise, it will change the level of methylation of the relevant genes. Up till very recently, it was thought that the level of gene methylation is reset in germ cells, but new studies indicate that some of this methylation does in fact get passed on to the next generation (though not very much). Methylation controls to what degree a gene manifests itself, so your behaviour will effect the characteristics of your children to some, very limited degree. Nevertheless, you are right that the genetic code itself is not affected.
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Guynemer
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quote: Originally posted by Urban Ranger
That's a common misconception most people hold, that somehow a one-celled organism got "created" out of scratch from the primordial soup. Creationists have been attacking this point in a futile attempt to "disprove" evolution. The mistakes here are:
- Evolution is not concerned about the origin of life on earth. It is concerned with how one lifeform gives rises to another (this is a rather imprecise way of putting it).
- Life didn't begin at a single-celled organism. It began when something could replicate itself. Reproduction, afterall, is the hallmark of life.
Since large numbers of large molecules can replicate itself, it is a lot easier for life to be formed from this primordial soup than Creationists put it. For example, polypetides can deplicate itself under suitable conditions, such as when the building blocks (peptides and amino acids) are available, the first life on earth could easily be some polypetide strands. |
Fascinating. I suppose I had heard this before, but it just sort of dawned on me... in a sense, we are all evolved from... prions. Gadzooks! Amazing that they are so toxic and deadly to us today.
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