Books break the shackles of time, proof that humans can work magic.

Science ... looks skeptically at all claims to knowledge, old and new. It teaches not blind obedience to those in authority but to vigorous debate, and in many respects that's the secret of its success.

I believe that the extraordinary should be pursued. But extraordinary claims require extraordinary evidence.

Sailors on a becalmed sea, we sense the stirring of a breeze.

Advances in medicine and agriculture have saved vastly more lives than have been lost in all the wars in history.

It seems madness to say, 'We're worried that they're going to become addicted to marijuana' -- there's no evidence whatever that it's an addictive drug, but even if it were, these people are dying, what are we saving them from?

The passion to explore is at the heart of being human.