The irrationality of disgust suggests it is unreliable as a source of moral insight. There may be good arguments against gay marriage, partial-birth abortions and human cloning, but the fact that some people find such acts to be disgusting should carry no weight.

Empty heads, cognitive science has taught us, learn nothing. The powerful cultural and personal flexibility of our species is owed at least in part to our starting off so well-informed; we are good learners because we know what to pay attention to and what questions are the right ones to ask.

I am never going to write about dogs again. You can write about Islam, you can write about sexuality, but no, not dogs.

What I mean by "empathy" is putting yourself in other people's shoes, feeling what they feel.

I have huge admiration for people who think like the effective altruist, who try to rationally think about how they can change the world for the better, and who try not to be swayed by irrational considerations, such as skin color or whether or not someone lives in the same neighborhood.

This enthusiasm [for empathy] may be misplaced. Empathy has some unfortunate features – it is parochial, narrow-minded and innumerate. We’re often at our best when we’re smart enough not to rely on it.

I kind of like social media, and I like hearing from people. I don't like the ugly stuff, but there are some people - smart people - who have a very different perspective, and I'll get a backlash from them. And this isn't necessarily a bad thing.