This is probably one of the coolest things to do i...

This is probably one of the coolest things to do in Geneva, and a lot of people miss it. We went without booking a tour, but they had one spot open, so my friend (a physics buff) went and I did the exhibitions. I expected to have to find something else to do during her 2 hour tour, but the exhibitions took up nearly that time. If you have to pick one, go with Particles of the Universe. Microcosms explains the large hydrogen collider. Both give extensive information, but are understandable even if you have a lesser knowledge of physics (like me).