When you can measure what you are speaking about, and express it in numbers, you know something about it.

If you can not measure it, you can not improve it.

If you study science deep enough and long enough, it will force you to believe in God.

Heavier-than-air flying machines are impossible.

Can you measure it? Can you express it in figures? Can you make a model of it? If not, your theory is apt to be based more upon imagination than upon knowledge.

When you are face to face with a difficulty, you are up against a discovery.

In science there is only physics; all the rest is stamp collecting.

Radio has no future." "X-rays are clearly a hoax". "The aeroplane is scientifically impossible.

To measure is to know.

Large increases in cost with questionable increases in performance can be tolerated only in race horses and fancy women.

Fourier is a mathematical poem.

Time is the single most important resource that we have. Every single minute we lose is never coming back.

I am so tired, I can hardly type these worfs.

As far as I'm concerned, men like you were put on this world to entertain women like me.

Keep on questioning. Keep on searching.

We're looking at available sources, all sources, in the area of additional energy.

Body is not stiff, mind is stiff.

There is no small act of kindness. Every compassionate act makes large the world.

If we were to promise people nothing better than only revolution, they would scratch their heads and say: 'Is it not better to have good goulash?'

The size and quality of your achievement will depend largely upon what sort of image you have of yourself at your best.

I am not sure that it is a bad thing to go to a school, as I did, where the boys threw things at me, and asked if there was nothing else I could do [but draw].