The bottom line is that time travel is allowed by the laws of physics.

Science is very good at answering the 'how' questions. 'How did the universe evolve to the form that we see?' But it is woefully inadequate in addressing the 'why' questions. 'Why is there a universe at all?' These are the meaning questions, which many people think religion is particularly good at dealing with.

The bottom line is that time travel is allowed by the laws of physics.

I like 'The Simpsons' quite a lot. I love the irreverent character of the whole show. It's great.

When we benefit from CT scanners, M.R.I. devices, pacemakers and arterial stents, we can immediately appreciate how science affects the quality of our lives.

I think math is a hugely creative field, because there are some very well-defined operations that you have to work within. You are, in a sense, straightjacketed by the rules of the mathematics. But within that constrained environment, it's up to you what you do with the symbols.

I believe we owe our young an education that captures the exhilarating drama of science.