Thank you, thank you, thank you Island Man for pointing out that evolution occurs at the POPULATION level, not the level of the individual organism!
I know that there are some intelligent people who would readily agree with the obvious truth of evolution at the population level as long as you didn't use THE WORD EVOLUTION. As soon as you use that word, though, their brains turn off.
Now I'm wondering if it would be fun (and possibly fruitful) to discuss the "Theory of Progressive Allele Frequency Change" with my otherwise intelligent dad and see if he'd agree it made sense. And THEN casually mention that that's actually what the theory of evolution actually means.