This is a thread to share fun facts, they should be space related, but if it's really interesting, doesn't have to be. It could be anything from something you learnt today to a very old story you heard years ago, as long as it's interesting and Forum Friendly. I'll start: Gordon Cooper (my favorite astronaut) had a guidance system malfunction on the final mercury mission, and then, in probably the biggest bunch of awesomeness in spaceflight history, used two pencil lines on his window,