There are no happy endings in history, only crisis points that pass.

Creationists make it sound as though a 'theory' is something you dreamt up after being drunk all night.

Humanity is cutting down its forests, apparently oblivious to the fact that we may not be able to live without them.

And in man is a three-pound brain which, as far as we know, is the most complex and orderly arrangement of matter in the universe.

Uncertainty that comes from knowledge (knowing what you don't know) is different from uncertainty coming from ignorance.

Early in my school career, I turned out to be an incorrigible disciplinary problem. I could understand what the teacher was saying as fast as she could say it, I found time hanging heavy, so I would occasionally talk to my neighbor. That was my great crime, I talked in school.

I don’t like anything that’s got to be. I want to know why.