Tickling was a form of torture used in ancient China on nobility because it left no mark and recovery was quick.
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Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
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There is a tiger named Kenny who is the only known tiger to have downs syndrome.
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The drummer for the rock group Def Leppard only has one arm.
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There's an isolated tribe in Zimbabwe where the people have only two toes, dubbed the 'ostrich people'.
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