All scientific men will be delighted to extend their warmest congratulations to Tesla and to express their appreciation of his great contributions to science.

The only possible conclusion the social sciences can draw is: some do, some don't.

Gentlemen, we have run out of money. It is time to start thinking.

I have to keep going, as there are always people on my track. I have to publish my present work as rapidly as possible in order to keep in the race. The best sprinters in this road of investigation are Becquerel and the Curies.

[From uranium] there are present at least two distinct types of radiation one that is very readily absorbed, which will be termed for convenience the α radiation, and the other of a more penetrative character, which will be termed the β radiation.

The energy produced by the breaking down of the atom is a very poor kind of thing. Anyone who expects a source of power from the transformation of these atoms is talking moonshine.

I must confess it was very unexpected and I am very startled at my metamorphosis into a chemist.