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[–][deleted] 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (1 child)

A person could die from spending 24 hours or more upside down

[–][deleted] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

Theoretically.

If this person is fit and used to it: You know your hypothesis doesn't apply.

Evolution adapts. To everything.