korrents

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Evolution made human babies effectively premature, since bipedalism shrank pelvises while brains grew larger, forcing late fetal development outside the womb.

Drawn from what Tim Urban said

What this subject means

evolutionary biology Natural selection as an explanation, including the problem of how cooperation survives it.

What Tim Urban actually said

  1. Tim Urban Writer and illustrator behind Wait But Why
    The problem is, when humans went bipedal, our pelvises got smaller, and as humans got smarter, our heads got bigger. So evolution had to get creative. Its solution: all human babies would be premies, born when they were still small enough to pass through a human pelvis.

Added to korrents 20 Sept 2026 · How quotes work · Something wrong? Tell us

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