"The theory of evolution is one of the best-known scientific theories around. Try to make it through a day without using or hearing the word "evolution" and you'll see just how widespread this theory is."
Best known as in famous, yes, but least understood (even by scientists). The word evolution has a more general meaning than the Darwinian one, denoting change over time, and it is this meaning that is usually refered to. Just because a theory/concept is widespread does not make it right or true.