300 bones · All Facts

300 bones
A baby is born with about 300 bones that fuse to form the 206 bones adults have.
SrcNIAMS (NIH)

Next evidence →true chinModern humans are the only mammals with a true chin.

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120 daysHealthy red blood cells circulate for up to about 120 days before the spleen and liver clear them.
red blood cellsThe spleen filters blood in its red pulp — trapping and recycling aging or damaged red blood cells.
2–3 million red blood cells every secondBone marrow releases about 2–3 million red blood cells every second into circulation.
hiccupsThe diaphragm is the main muscle of breathing — and sudden spasms of it cause hiccups.

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