Science is the greatest of all adventure stories, one that's been unfolding for thousands of years as we have sought to understand ourselves and our surroundings.

I've seen children's eyes light up when I tell them about black holes and the Big Bang.

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

We can certainly go further than cats, but why should it be that our brains are somehow so suited to the universe that our brains will be able to understand the deepest workings?

There's no way that scientists can ever rule out religion, or even have anything significant to say about the abstract idea of a divine creator.

The main challenge that television presents is that I have a tendency to say things with a great deal of precision and accuracy. Often a description of that sort, which will work in a book because people can read it slowly - they can turn the pages back and so on - doesn't really work on TV because it interrupts the flow of the moving image.

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