>>11321647
>cooling
efficient thermal transfer to head, and microwire hair to conduct heat away
>fuel cell
>>>>turns back into water
humans already have facilities to dispose of "waste water" in every settlement
>structure
that one is a bugbear, my general thought if you're trying to get the "humanoid" look and bodyplan, you could have most of the essential components in a well protected central location, and have serviceable components out further, like putting the power storage in the arms and legs
>sleep
The main goal is to prevent https://en.wikipedia.org/wiki/Thrashing_(computer_science) and by taking several hours in a lower power mode they can optimize memory usage, and commit important things to long-term storage instead of keeping it in ram.
>lube
ero