Man has learned to fly like the birds. Now all he has to do is work out how to do it quietly.

I've always been struck by how unsuspicious people are in general, if you tell them what you're about.

Economics is the science which studies human behaviour as a relationship between ends and scarce means which have alternative uses.

I heard that [Clarkson] said some petty things about someone I care deeply about, so I just made some petty remarks 'cause I'm a petty guy.

The wise individual doesn't get too attached to any of life's pleasures, knowing that wonderful science is hard at work proving it's bad for him.

Optimism, unaccompanied by personal effort, is merely a state of mind and not fruitful.

It is possible that our race may be an accident, in a meaningless universe, living its brief life uncared for, on this dark, cooling star