One thing I didn't realize about Alan Shepard's original suborbital flight is that he experienced much higher G-forces on re-entry (11.5) than even astronauts coming back from the Moon (7), which explains why space tourism suborbital flights are just barely over the Kármán line
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According to John Young, NASA learned the hard way that the suction fan in the space toilet was underpowered on the first six-person Shuttle flight.
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