[Evolution is] a theory in a special philosophical ...

[Evolution is] a theory in a special philosophical sense of science, but in terms of ordinary laymen's use of language, it's a fact... Evolution is a fact in the same sense that it's a fact that the Earth is round and not flat, [that] the Earth goes round the Sun. Both those are also theories, but they're theories that have never been disproved and never will be disproved.