“Do you know every creationist has a blind spot?”
– Randolph Nesse
Evolution is only a theory. Yeah, so is gravity. And germ theory. But you don’t see people carrying banners that say “Teach the controversy” for those theories. Teach the controversy! There is no controversy. All the scientists with any level of credibility and knowledge on the matter accept evolution as a fact. The disputes are only between scientists and non-scientists, and since the topic is science, the non-scientists don’t get to vote.
But the gaps in the fossil records. Show me the transitional fossils. Well, every time a scientist comes up with one, it only makes the creationists even more happy as there are now two new gaps to explain in the fossil record. Intelligent design you say. Hmm, I bet I know who your intelligent designer is going to be. How about an intelligent theory of falling. Then you can teach the controversy in the theory of gravitation. As Nick Matzke rightly quipped :
Intelligent design is creationism in a cheap tuxedo.
More evidence? First get hold a good book on evolution. I recommend The Greatest Show on Earth by Richard Dawkins. He has poured his heart out in explaining the various evidence available for evolution, not just from fossil records, but from radiometric dating, palaeontology, embryology, anatomy, genetics, artificial breeding and geography. The following is an except from the book (Chapter 11, pp.356) which shows an example of unintelligent design in mammals (that includes us).
[Recurrent laryngeal nerve] is a branch of one of the cranial nerves, the vagus (the name means ‘wandering’ and is apt), has various branches, two of which go to the heart, and two on each side to the larynx (voice box in mammals). On each side of the neck, one of the branches of the laryngeal nerve goes straight to the larynx, following a direct route such as a designer might have chosen. The other one goes to the larynx via an astonishing detour. It dives right down into the chest, loops around one of the main arteries leaving the heart (a different artery on the left and right sides, but the principle is the same), and then heads back up the neck to its destination. If you think of it as a product of design, the recurrent laryngeal nerve is a disgrace.