Barring serious accidents, if you are not preoccupied with worry and you work hard, you can look forward to a reasonably lengthy existence.... Its not the hard work that kills, its the worrying that kills.

Success is the result of hard work.

I will not say I failed 1000 times, I will say that I discovered there are 1000 ways that can cause failure

I am afraid of radium and polonium ... I don't want to monkey with them.

Oh these mathematicians make me tired! When you ask them to work out a sum they take a piece of paper, cover it with rows of A's, B's, and X's and Y's ... scatter a mess of flyspecks over them, and then give you an answer that's all wrong!

Education isn't play--and it can't be made to look like play. It is hard, hard work. But it can be made interesting work.

The radio craze will die out in time.