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TIL the first domesticated cattle were in Iran 10,000 years ago, and most cattle today are descendants of only 80 cows.

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kJ1Ee TIL that during the 'leech craze' of the 1800s, leech collectors (who were usually women) would wade into ponds with their skirts raised to attract the leeches to their bare legs. Some used animals—such as horses that were too old to work—instead of their own bodies to catch the leeches
9wP06 TIL that, by one definition, Canada did not become politically independent of Great Britain until 1931. Because it was a gradual process, it is quite difficult to identify a single date of Canadian independence.
b6YNN TIL that other than the carbon in blood diamonds, tantalum is the only pure chemical element to face international sanctions requiring conflict-free sourcing
OGVoL TIL that some people engage in 'platonic co-parenting', where they raise children together without ever being in a romantic relationship
XEjaR TIL about the Uncombable Hair Syndrome(UHS), a disease that, as its name says, makes the hair of people impossible to comb, due to the triangular shape of the hair shaft.