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Watch NASA's Mars helicopter Ingenuity test its blades! (video)

In the 60s "Astronaut happiness wasn’t a factor” says historian David Hitt. On Skylab 4, in 1973, the crew was overworked with packed schedules each day. They told NASA they couldn't keep up. This event is misreported as a "mutiny," but it had big effects. Astronauts now work 9-5, with weekends off.