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TIL Charcoal toothpaste whitens your teeth by sanding off your outer enamel

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Y4EZ TIL the possible origin of the phrase “knock on wood” comes from Germanic folklore, “wherein dryads are thought to live in trees, and can be invoked for protection.”
mMdy TIl that after a classified Corona spy satellite’s film capsule was found by Venezuelan farmers and broken open, the US realized that labeling it “Secret” was a bad idea. Later capsules offered in eight languages a reward for returning it to American officials.
9J8Q TIL that spiders can be affected by different drugs, like marijuana and LSD, which shows in their web-making. This phenomenon has been studied by NASA.
e1Mg TIL Rick and Morty only exists because Bill Cosby’s lawyers sent a cease and desist to Justin Roiland and Dan Harmon in 2005 over an internet series called ‘House of Cosbys’.
j6VGv TIL there is a town in Texas USA named "Canadian" and its citizens are called "Canadians"