Speaking of this: let’s talk about space settlement.

If you’re going to stay, you are going to be having babies.

Any tech tree proposal for a space settlement (planet, moon, spin stations, whatever) that does not address how to make and reuse or recycle diapers is not serious.

I never see this mentioned in sci-fi or in space nerd discourse around stuff like what you need to settle Mars. It’s up there with potable water, at least if you want humans to reproduce.