I've watched astronauts go to lots of trouble trying to install solar panels onto space stations. Why haven't they been clever and hung a few cables from the space station and let them generate electricity by letting them move across the Earth's magnetic field? Normally a generator works by moving a magnet through a magnetic field. This would be far less expensive than solar panels, so why don't they do it?

Could you please explain to me the very basics of string theory? I failed lego at school and I'm not very technical.

I was in Peru a while ago and saw an saw an ancient ceramic pot from the Moche culture with a very gruesome decapitation scene on it. Were these ancient civilisation really blood-thirsty and violent or is this just a little thing equivalent to our video nasties?

Did Atlantis actually exist? Also, there's supposed to be a cave in France that seems to show planets and was drawn about 33 thousand years ago. The planets weren't discovered until the 1950s. Is this true or not?

Did oil or natural petroleum deposits really come from primordial forests? With the thousands of barrels of oil taken out every day, there must have been an awful lot of trees.

If we lose gravity, what will happen? Will everything fly up in the air?

I come from Dorset and there's a hill with a pond up there. The strange thing is that it never dries out. Why is this?