I have to admit I was initially put off by the guy's voice and hair, but it's a thrilling talk.

When he says the real science is on Mars, though, I'd raise the challenge and say it's on Europa, Enceladus, Io, Ganymede and Callisto. I mean hot oceans protected from radiation through tick ice. What else do you need?

We may find fossil and even bacterial life on Mars (and that would possibly be the greatest human discovery yet), but I bet we can find a thriving ecosystem full of complex multicelular life on one of those Moons.