A scientist is never certain. ... We absolutely must leave room for doubt or there is no progress and there is no learning.

Our imagination is stretched to the utmost, not, as in fiction, to imagine things which are not really there, but just to comprehend those things which are there.

As usual, nature's imagination far surpasses our own, as we have seen from the other theories which are subtle and deep.

If you keep proving stuff that others have done, getting confidence, increasing the complexities of your solutions - for the fun of it - then one day you'll turn around and discover that nobody actually did that one! And that's the way to become a computer scientist.

Don't worry about anything. Go out and have a good time.

If an apple was magnified to the size of the Earth, then the atoms in the apple would be approximately the size of the original apple.

If you thought you were trying to find out more about it because you're gonna get an answer to some deep philosophical question...you may be wrong! It may be that you can't get an answer to that particular question by finding out more about the character of nature. But my interest in science is to simply find out about the world.