String theory envisions a multiverse in which our universe is one slice of bread in a big cosmic loaf. The other slices would be displaced from ours in some extra dimension of space.

I think the relationship between memory and time is a very deep and tricky one, to tell you the truth. I don't consider memory another sense. I do consider memory that which allows us to think that time flows.

The real question is whether all your pondering and analyses will convince you that life is worth living. That's what it all comes down to.

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

String theory envisions a multiverse in which our universe is one slice of bread in a big cosmic loaf. The other slices would be displaced from ours in some extra dimension of space.

Exploring the unknown requires tolerating uncertainty.

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