It has become quite popular among Creationists to claim that evolution is "just a theory" and therefore not a proven fact. This was echoed by Ronald Reagan in a campaign speech given in Dallas, "Well, it is a theory [referring to evolution]. It is a scientific theory only, and it has in recent years been challenged in the world of science--that is, not believed in the scientific community to be as infallible as it once …showed first 75 words of 582 total…

…showed last 75 words of 582 total…itself is doubted. In reality though, this is how all science works, and indeed should work. All healthy scientific theories will continue to be debated in the endless human quest for knowledge. Eldredge, Niles. The Triumph of Evolution and the Failure of Creationism. New York, NY: Nevraumont Publishing Company, 2000. Mayr, Ernst. What Evolution is. New York, NY: Basic Books, 2001. Moran, Laurence, Evolution is a Fact and a Theory" http://www.talkorigins.org/faqs/evolution-fact.html