What does the human body have more than 5 million of? strip info approved by DaveKellett
NARRATOR: The human body has more than 5 million hair follicles.
You've probably noticed that body hairs seem to "know" when to stop growing, as they're all a consistent height.
Actually it's their fixed growth cycle that keeps their length consistent. Order is maintained by the growth cycle of the hairs themselves.
Cross-cut view of hair follicle
NARRATOR: Until the age 65 or so...When hairs start saying "Shine it" to the rules. Robert, the rogue hair: SHINE IT. I'm goin' for it. Concerned Hair: Robert, no!!
Closeup of Human skin with hairs
ARTHUR (scared): myaaaAH GRAMP (with lone long ear hair): ...another one?