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TIL that within a month of opening her pediatric clinic, Dr. Kathleen Holland experienced six cases of children stopping breathing during their visit, one of whom died. One of her nurses had been administering dangerous injections to them, and was in fact a serial killer, unbeknownst to Dr. Holland.

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6EPXW TIL fiber-optic internet cables on the sea floor has to be wrapped in kevlar to protect them from shark bites
wom1E TIL of "shifting baseline syndrome" which is ‘a gradual change in the accepted norms for the condition of the natural environment due to a lack of experience, memory, and/or knowledge of its past condition'.
vxmR TIL that mandatory right-hand traffic was introduced in Europe by Napoleon with the aim of deterring swordfighting on horseback, and because the traditional left-hand traffic was seen as aristocratic. Since he never conquered Britain, left-hand driving would remain there.
vPepB TIL that termites are one of the planet's most effective bioreactors; they can make up to two liters of hydrogen from consuming a single sheet of paper, which is why they are being studied as a potential renewable energy source.
ZpJo4 TIL research shows that reading literature makes people smarter and nicer