Science and religion are the two most powerful forces in the world. Having them at odds... is not productive.

Women are extraordinary in lacking the estrus, or period of heat. The females of most other primate species become sexually active, to the point of aggression, only at the time of ovulation. Why has sexual responsiveness become nearly continuous? Unusually frequent sexual activity between males and females served as the principle device for cementing the pair bond.

Ideas emerge when a part of the real or imagined world is studied for its own sake.

The living environment is the biosphere, the thin layer around the world of living organisms. We're part of that. Our existence is dependent on it in ways that people haven't even begun to appreciate. Our existence depends not just on its existence, but its stability and its richness.

That is the great mystery of human evolution: how to account for calculus and Mozart.

Search until you find a passion and go all out to excel in its expression.

Sometimes a concept is baffling not because it is profound but because it is wrong.