Time travel was once considered scientific heresy, and I used to avoid talking about it for fear of being labelled a 'crank.'

If you understand how the universe operates, you control it in a way.

I think computer viruses should count as life.

Jesus loves you, but everyone else thinks you're an ass.

We explore because we are human and we want to know. I hope that Pluto will help us on that journey.

The universe does not behave according to our pre-conceived ideas. It continues to surprise us.

[On President Bush's plan to get to Mars in 10 years] Stupid. Robots would do a better job and be much cheaper because you don't have to bring them back.