The thing that defines a species is that all members have the same addressing system for their DNA.

If you set out in a spaceship to find the one planet in the galaxy that has life, the odds against your finding it would be so great that the task would be indistinguishable, in practice, from impossible.

Ideally, I'd like everybody to be secular.

I think what I'd really like to see would be a mass consciousness-raising movement so that we would all become vegetarian.

It is an absurd law [Section 295A of the Indian penal code] but also extremely dangerous because it gives fanatics, whether they are Hindus, Catholics or Muslims, a licence to be offended. It also allows people who are in dispute with you to make up false accusations of blasphemy.

The odd thing about tradition is, the longer it's been going, the more people seem to take it seriously - as though sheer passage of time makes something which to begin with was just made up, turns it into what people believe as a fact.

For me, moral questions such as stem-cell research turn upon whether suffering is caused. In this case, clearly none is. The embryos have no nervous system. But that's not an issue discussed publicly. The issue is, Are they human? If you are an absolutist moralist, you say, "These cells are human, and therefore they deserve some kind of special moral treatment."