Peristalsis

AJ Webster once posed a thought problem to Dave and I, thinking the answer was obviously "Sleep."

The problem was to consider our biological functions. If we could chose one to make somehow unnecessary, what would it be?

To me the obvious answer was to replace peristalsis with some sort of internal vacuum to push food through our GI tract, although because this was a pressure based solution, it would make digestion in space and air
travel more complicated.

My runner up idea was to replace walking as the method of ambulation with some sort of cilia + air cushion "ground effect"

The obvious answer was not "sleep"
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