'Why are we here?' 'What is our purpose? 'Is there an afterlife?' 'Is there a God?' 'Is it all about science?' Those are big questions, and usually, TV is a little scared to go there.

There's a reason evolution is a hot-button issue. It's not just a matter of science, either. It's a matter of the big questions in life - why are we here, what is truth, where is our moral basis?

I've never worried about life's big questions.

Science goes from question to question; big questions, and little, tentative answers. The questions as they age grow ever broader, the answers are seen to be more limited.

I first started asking big questions when I was 12, and by big questions, I mean, 'Why are we here? What is this business? We're alive for a few short decades and then poof, we're out of here.'

There are still a lot of big questions about what they would have eaten.