The average astronaut has also changed quite a bit, too. At first, they were all young and super-fit ex-military men, but nowadays they are more likely to be middle-aged science-y types and women.

By the way, freeze-dried ice cream isn’t real astronaut food. Although the stuff was developed for NASA and even appears in the Apollo 7 press kit (PDF, page 83), it has never flown into space ...

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