Americans have a weird relationship with NASA. The National Aeronautics and Space Administration runs educational programs all the time, but it's easy for the rest of us to forget about it until they do something totally spectacular, like landing the Mars Curiosity rover. We fret about the agency's expense, but meanwhile, we all secretly wish we were part of it. One can never overestimate the body of knowledge that NASA has contributed to mankind. So let's learn some things we didn't know about NASA in this week's episode of the mental_floss List Show.