eating
interacting
talking
walking
muscles
hands
legs
brains
their sense of balance doesn’t change
their sense of balance gets worse
their sense of balance gets better
regular gravity
microgravity
zero gravity
it slows down
it speeds up
nothing, it stays the same
it swells with fluid before shrinking
migraines
food poisoning
motion sickness
sleeping sickness
torso and head
legs and arms
stomach
lungs