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TIL that the Philadelphia Derringer which became popular with assassins, were almost always sold in matching pairs and are now these days very hard to find still in this condition.

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6EwvX TIL that caffeine is used in certain shampoos to prevent hair loss. It's becoming more and more popular as time progresses.
GY09Q TIL About 10,000 years ago all humans had brown eyes.
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