When all thermonuclear sources of energy are exhausted a sufficiently heavy star will collapse. Unless fission due to rotation, the radiation of mass, or the blowing off of mass by radiation, reduce the star's mass to the order of that of the sun, this contraction will continue indefinitely.

The people of this world must unite or they will perish.

We do not believe any group of men adequate enough or wise enough to operate without scrutiny or without criticism.

You can certainly destroy enough of humanity so that only the greatest act of faith can persuade you that what's left will be human.

Both the man of science and the man of art live always at the edge of mystery, surrounded by it. Both, as a measure of their creation, have always had to do with the harmonization of what is new with what is familiar, with the balance between novelty and synthesis, with the struggle to make partial order in total chaos.... This cannot be an easy life.

Maybe General Groves was right. Maybe we should just banish thinking forever.

There are children playing in the streets who could solve some of my top problems in physics, because they have modes of sensory perception that I lost long ago.