My younger son told me nobody uses email anymore. I'm this old fogie with my email. I don't know what I'm supposed to communicate with now - SnapChat?

I think we're going to care more about Americans than Africans. I don't think that's ever going to go away, and I don't think it's ever going to go away that people care more about their families than strangers, and their communities over other communities. But I think it would transform the world in such a good way if we could just acknowledge, at least intellectually, that an African life and an American life are the same.

Because of empathy, stories of the suffering of one person could lead us into a war that could kill millions of people.

I think there's some evidence that when it comes to being a doctor or nurse, a police officer or therapist, that empathetic engagement leads to burn-out. Imagine if you're dealing with severely ill children, and you felt their pain all the time, and the pain of their parents - you wouldn't be able to do that job for very long. It would kill you.

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.

My brother is severely autistic, so when I was a kid I spent a lot of time as a teenager in camps and programs for autistic kids. When I went to McGill as an undergraduate, I figured I'd be a therapist working with these kids. The truth is, and I knew this even back then, I'm just not good at this. I'm too empathic to do this sort of thing.

Philosophers have often looked for the defining feature of humans — language, rationality, culture, and so on. I'd stick with this: Man is the only animal that likes Tabasco sauce.