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

When there's no experimenting there's no progress. Stop experimenting and you go backward. If anything goes wrong, experiment until you get to the very bottom of the trouble.

I do not believe in the God of the theologians; but that there is a Supreme Intelligence I do not doubt.

My mother was the making of me. She was so true and so sure of me, I felt that I had someone to live for - someone I must not disappoint. The memory of my mother will always be a blessing to me.

My main purpose in life is to make money so I can afford to go on creating more inventions.

I never knew I had an inventive talent until Phrenology told me so. I was a stranger to myself until then!

Two per cent. is genius, and ninety-eight per cent. is hard work.