You can stand for long periods of time without issues, but can only be upside down for a short period of time before you get major head rush.
In: Physics
Your body was designed to walk upright, this is one of our unique ape characteristics
Some animals and bugs can hang upside down – because they are “built” for it
Some animals can live on the bottom of the ocean because they’re “built” for it
Same sort of thing. We were built to be upright.
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