Many things are improbable, only a few are impossible.

I just want to retire before I go senile because if I don't retire before I go senile, then I'll do more damage than good at that point.

I feel very strongly that SpaceX would not have been able to get started, nor would we have made the progress that we have, without the help of NASA.

I think long term you can see Tesla establishing factories in Europe, in other parts of the U.S. and in Asia.

When Henry Ford made cheap, reliable cars people said, 'Nah, what's wrong with a horse?' That was a huge bet he made, and it worked.

The key test for an acronym is to ask whether it helps or hurts communication.

You could warm Mars up, over time, with greenhouse gases.