A picture is worth a thousand words...and uses up a thousand times the memory.

Someone told me that each equation I included in the book would halve the sales.

You may see a cup of tea fall off a table and break into pieces on the floor... But you will never see the cup gather itself back together and jump back on the table. The increase of disorder, or entropy, is what distinguishes the past from the future, giving a direction to time.

Do you believe in first love - or should I pass by again?

So next time someone complains that you have made a mistake, tell him that may be a good thing. Because without imperfection, neither you nor I would exist.

Our only chance of long-term survival is not to remain lurking on planet Earth, but to spread out into space.

I don't know what my IQ is. People who gloat about their IQ's are losers