Biological vs. Philosophical Perspectives on Morality

(This is from my archives and is undated; I'm guessing I wrote this about a decade ago. I think it is still relevant, as evidenced by Jerry Coyne's article about explaining morality.)

I recently updated one of the official FAQs for the *.atheism newsgroups. (For interested parties, I updated the "Atheist Media FAQ" at http://www.infidels.org/news/atheism/....) In private email, I received