Women. They are a complete mystery. - Stephen Hawking

The subject of this book is the structure of space-time on length-scales from 10^-13cm, the radius of an elementary particle, up to 10²⁸cm, the radius of the universe. ...we base our treatment on Einstein's General Theory of Relativity. This theory leads to two remarkable predictions about the universe: first, that the final fate of massive stars is to collapse behind an event horizon to form a 'black hole' which will contain a singularity; and secondly, that there is a singularity in our past which constitutes, in some sense, a beginning to the universe.

The computer in your cell phone today is a million times cheaper and a thousand times more powerful and about a hundred thousand time smaller than the one computer at MIT in 1965.

It's tempting to dismiss the notion of highly intelligent machines as mere science fiction, but this would be a mistake, and potentially our worst mistake ever.