I have experimental evidence that time travel is not possible.

The whole history of science has been the gradual realization that events do not happen in an arbitrary manner, but that they reflect a certain underlying order, which may or may not be divinely inspired.

I don't fear God- I fear His believers.

Its a crazy world out there. Be curious.

Observations indicate that the universe is expanding at an ever-increasing rate. It will expand forever, getting emptier and darker. Although the universe doesn’t have an end, it had a beginning in the Big Bang. One might ask what is before that but the answer is that there is nowhere before the Big Bang just as there is nowhere south of the South Pole.

When something is made idiot proof, they will just make better idiots.

My first popular book, 'A Brief History of Time,' aroused a great deal of interest, but many found it difficult to understand.