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Sexual dimorphism of the human pelvis illustrated.
The balls represent the size of a newborn baby's head, which will pass through the female pelvis fairly easily, but will get stuck in the male pelvis
Potential energy turns into kinetic energy, which turns into elastic energy, that is returned as kinetic and then new potential energy.
This is how energy, minus small dissipations, is conserved.
[📹 Norrana Hadassa]