1) Fusion, will it give us cheap, unlimited power?

2) Not only did humans evolve from an ape-like creature, we also evolved from fish.

Can we reverse aging? We ask scientists this question.

What can bio technology tell us about disease and evolution?

We ask biotech pioneer Dr. Lanza.

Going to Mars with Dr. Robert Zubrin - is that the next destination?

Bring Theory: the theory of everything, or a theory of nothing?

Physicists like

Brian Greene discuss the question.

Time travel, is it real? What about

Einstein's view about time travel?

Is there a God? What does science say?

Genetic engineering can solve many problems.

But how dangerous can genetic engineering get?

Broken arrow - with so many nuclear weapons in the US arsenal, what about the chances of an accidental detonation, which almost happened several times in the past?

Guests:

Dr. Daniel Dennet and Dr. Stephen Pinker

debate philosophy and science