My gut response to prosequence's post is to say "Go on, pull the other one."
Evolution is a change in the genetic structure of a population over time. Such changes are known to actually occur. They have been observed. Evolution is a fact.
Thus, we can study known instances of evolution, and see what sort of telltales evolution leaves behind. Thus, when we find these telltales in a population that has not been under constant observation, we can say that these telltales are evidence that the population evolved... because, by observing evolution in action and how it affects the genome, we have established a standard of evidence. We can say if a given piece of information is evidence for, or against, evolution.
On the other hand, we have no standard of evidence for creationism. Thus, it is impossible to claim anything as evidence of creation... or evidence against. It is not science, and it has no evidence. It cannot have any evidence.... because creationism has provided no basis for identifying evidence for or against it.
Intelligent design is in basically the same boat as regular creationism... though I suppose someone could formulate a sufficiently rigorous definition of "intelligent design" to establish a standard of evidence by examining human artifacts. I have a feeling no one has done this publically is because they'd find no evidence of intelligent design in living things... and possibly evidence against. Which means all you'd do is show it to be a false theory, or a practically useless one.
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Simple Machines in Higher Dimensions
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