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Cowlick

Brad Pitt's and fruit flies' cowlicks controlled by cancer protein

What does Brad Pitt have in common with a fruit fly? His Hollywood hairstyles cover a prominent cowlick -- the swirl of hair that that is caused by a patterning mechanism also active in our two-winged friends -- that similarly feature 'polarized' hair patterns. Ref. Source 6u

Image from Wikimedia public domain.

Cowlick

I've heard that a nice big cowlick is a sign of intelligence and that you will make a lot of money. Just an old lady's tale from an old lady.