1. Astronauts wear diapers.
Well technically it's called a "Maximum Absorbency Garment" but for all intents and purposes it's... a diaper. See, missions are generally pretty unpredictable and might have a bunch of delays. And when you can't just unbuckle and pop on the toilet, you have to make like a baby and let loose. Unconfirmed, but we're pretty sure astronauts change their own diapers.
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