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I don't remember a "john" on the shuttle.



There is one for in-orbit zero-G use. It can't be used or accessed on the launch pad.

Many flights had several "launch slots". If you weren't ready in time you could wait a bit and try again. Astronauts got to sit there and wait - nobody is going to go through all the trouble to get them out so they can go potty.

All but one remaining flight is planned to go to the space station (the other is the Hubble flight). The space station is so hard to get to - it's way far north - that there is only one ten minute launch slot per day, and the astronauts don't have to wait more than that.

So no more bladder-bursting hours-long wait. Even so I suspect they'll continue using diapers so there's no rush to unpack the toilet, and out of sheer habit.

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So to a mentally unbalanced astronaut it likely seems "normal".



I think they all wore diapers for every flight ever launched. I bet the Russians did too. It's the cheapest and most reliable solution.
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"If they can't picture me with a knife, forcing them to strip in an alley, I don't want any part of it. It's humiliating." - windsock