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Short answer: Skin protects itself, hair doesn't.

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L4bV TIL the median age of the country of Niger is 14.8 years old. 50% of the population is under the age of 15.
vP1wL TIL In 1978 a drunk guy tripping on LSD tried to blow up a dam in Nashville TN w/ his friends in order to loot the submerged town with through the use of scuba diving equipment
nWo9G TIL About the Great Vowel Shift: A period of time between 1400-1700 AD where modern English pronunciations of words took it's form, which is how far back in time you could travel before you could not longer converse effectively with others.
PYQme TIL Pierre Joubert (1701-1814), age 113, was believed to have been the oldest person who ever lived. It was later discovered Pierre died in 1766 at age 65 and his son by the same name died in 1814, causing the confusion
69y4m Today I learned that dolphins also get high