One pound of uranium is worth about 3 million pounds worth of coal or oil.

I'm a scientist, not a theologian. I don't know if there is a God or not. Religion requires certainty.

We'd never have got a chance to go outside and look at the earth if it hadn't been for space exploration and NASA.

You mustn't take what I say as gospel because no one can second-guess the future.

If we gave up eating beef we would have roughly 20 to 30 times more land for food than we have now.