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TIL: some people cut their hair with a vacuum

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wL5rM TIL Great white sharks DO NOT mistake human divers for pinnipeds (seals and sea lions). Attacks on people occur because they are sharp sighted, curious animals, prone to taking "taste tests" of unfamiliar objects that catch their eye.
epeRJ TIL of The Sawback Blade Bayonet. A German knife used in WW1 that would pull out the insides of it's victims and cause inevitable and painful death. They were recalled by the German military because British and French soldiers would torture and kill any soldiers caught with one, on principle.
YpLbr TIL Pepsi released a 'healthy soda' in Japan called "Pepsi Special", claiming that dextrin in the drink suppresses the absorption of fat. The drink is not available in the US, and Pepsi could face legal challenges from the FDA if brought over due to too much dextrin causing people to become sick.
W7RBY TIL In 36 BCE, Roman statesman Marcus Varro wrote about germs, describing “minute creatures which cannot be seen by the eyes, which…enter the body through the mouth and nose and there cause serious diseases.” The germ theory of disease would not be accepted widely for another 1,900 years.
neQY7 TIL about "mad honey": it's honey collected from bees that have fed on rhododendron flowers, and it causes hallucinations and intoxication