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

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xVLg0 TIL Some European countries have a "Freedom to Roam", which means that you can freely go into private land for recreation as long as you don't cause any problems
x6mk TIL that Computers have beat man at every game but one — the ancient Chinese board game Go. It is the oldest game in the world at which man remains the undisputed champion.
yQpXp TIL That the game Battleship dates back to turn of the 20th century, where is was played with just paper and pen. The game is said to have been played by Russian officers before WWI. A version using plastic pegs wasn't created until 1967.
OdO4 TIL - 2000 was the first year Martin Luther King Jr. Day was officially observed in all 50 states
AD70l TIL Scientists say schools in China should further increase outdoor time, including recesses, in order to reduce the risk of near-sightedness. In some parts of China, 90 per cent of high school graduates have nearsightedness