It is my earnest desire that some of you should carry on this scientific work and keep for your ambition the determination to make a permanent contribution to science.

When one studies strongly radioactive substances special precautions must be taken if one wishes to be able to take delicate measurements. The various objects used in a chemical laboratory and those used in a chemical laboratory, and those which serve for experiments in physics, become radioactive in a short time and act upon photographic plates through black paper. Dust, the air of the room, and one's clothes all become radioactive.

Humanity needs practical men, who get the most out of their work, and, without forgetting the general good, safeguard their own interests. But humanity also needs dreamers, for whom the disinterested development of an enterprise is so captivating that it becomes impossible for them to devote their care to their own material profit.

Each of us must work for his own improvement, and at the same time share a general responsibility for all humanity.

It was like a new world opened to me, the world of science, which I was at last permitted to know in all liberty.

First principle: never to let one's self be beaten down by persons or by events.

I am one of those who think like Nobel, that humanity will draw more good than evil from new discoveries.