[quote]schmichael wrote:
So please, enlighten me Joe (or Matt or anyine else). How does Lenski’s long term experiment prove that evolution is true?[/quote]
I hate to say it, but this statement does show a fundamental misunderstanding of how scientific studies are done and what the specific purpose of Lenski’s experiment is. Most people without advanced education (and some that do) in the hard sciences have the same problem, whether they subscribe to the ToE or not. I have outlined how scientific studies are done in other threads, such as that global warming swindle one, and Fletch did a good job of describing scientific methodology in the first Bill Nye thread, and I have also done so elsewhere, so I will not go into too much detail about scientific methodology here.
I am not trying to sound condescending here, either, all of my degrees are in the fields of mathematics and physics, so all of my knowledge of biology comes from a two semester intro to biology sequence that I was required to take in undergrad about 20 years ago that I barely paid attention in and the ToE only comprised 3 chapters of the sequence at that. This means that I know next to nothing about the field of biology in general and even less about the ToE. In fact, until this post I have not said one word in this thread on the ToE. All of my posts have regarded misconceptions people have regarding number theory, but since you mentioned me personally, which I didn’t realize right away, I thought I would look into it and conferred with my fiance who, while not an evolutionary biologist still holds a PhD in microbiology, and she gave me quite a bit of information.
First, evolution is a very broad field and has many components to it and it, like any scientific theory, takes a LOT of evidence from multiple experiments to be considered a theory, so you will not find a single study that encompasses the entirety of evolutionary theory and states “This one study proves all of evolutionary theory to be true.” All scientific theories evolve (no pun intended) as more information is discovered, and evolution is no different.
Lenski’s experiment was started with the goals of observing how the rates of evolutionary mutations change over time, and to see if those adaptations could be reproduced in separate population groups under the same conditions, and his experiments have indeed shown that. In fact, here is one of the many articles he has had published on his experiment:
The point of his experiment was not to demonstrate speciation, which is the splitting of a species into separate, distinct species. There is already a lot of other studies that have shown this phenomenon occur, both naturally and artificially. Here is just one of them:
http://www.lifesci.ucsb.edu/eemb/faculty/rice/publications/pdf/25.pdf
It is also not the point of Lenski’s experiment to prove common descent, there are plenty of other researchers working on that, usually geneticists studying common genes found in the various species throughout history, as well as similar and vestigial traits in certain species. Here is one such study that was done on common ancestry:
I don’t know enough about genetics and the field of biology as a whole to comment on the validity of the experiments, but my fiance and every credible biologist that I know is convinced, and I have not seen any credible scientific evidence to dispute the field of genetics.
My point, in case you missed it, is that there is no one study or experiment that one can point to and say: “this one proves evolution incontrovertibly” or “This one disproves evolution incontrovertibly” because it takes so many studies and repetitions of studies to even begin to say with any degree of certainty that a phenomenon is occurring or not occurring. There is enough evidence of evolution, as well as a lack of scientific evidence to disprove evolution, to say that yes, evolution does occur. Certain parts of the broad field of evolution may be, and by may I mean certainly are, wrong, but that is why we continue to experiment, to discover the truth and eventually do something useful and beneficial to society with the knowledge we scientists discover, like all the fancy medical advancements that have come from the study of genetics.