general theory of relativity and quantum mechanics. They are the great intellectual achievements of the first half of this century. - Stephen Hawking

Anaximander, a friend and possibly a student of Thales, argued that since human infants are helpless at birth, if the first human had somehow appeared on earth as an infant, it would not have survived. In what may have been humanity's first inkling of evolution, people, Anaximander reasoned, must therefore have evolved from other animals whose young are hardier.

As we shall see, the concept of time has no meaning before the beginning of the universe.

On seeing the Enterprise's warp engine while visiting the set of Star Trek: The Next Generation (where he would briefly play himself in the 1993 episode Descent, Part I), Hawking smiled and said: I'm working on that.