50 years ago today, Vostok 1 took off with Yuri Gagarin inside. He became the first man in space and was the Hero of the Soviet Unioin (real title). He died in a jet crash in 1968, but is still a national hero- and serious badass. How does one summon up that kind of courage? How does one go through the physical and mental trials of training, being put into vacuums, G-forces, and interrogations?