This is Sam Harris, author of Letter to to a Christian Nation and The End of Faith, speaking at Beyond Belief.
Harris’ thesis is that questions of morality are perfectly within the realm of scientific enquiry and, that because human well-being is realised at the level of the brain, an emerging and maturing brain science will have a lot to say about right and wrong.
While I have an easy time understanding the idea that morality is part of evolutionary inheritance I’ve always felt a little uneasy about how one reconciles value for diversity with a thesis that seems to suggest an homogenisation of cultural norms, but Harris goes some way to alleviating these concerns in this talk.