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TIL some bacteria evolved a needle-like structure for injecting other cells with special proteins. Type III secretion system , as it is called, is still poorly understood and we don't fully know how bacteria make them and how the needle itself works.

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jjKN TIL that diamonds are not rare or valuable and the reason demand is high is because of a marketing campaign by DeBeers to sell more engagement rings
8epaG TIL "Cute aggression" or the urge to squeeze cute animals or babies is the brain’s coping mechanism to temper the onslaught of positive feelings. Because if you find yourself incapacitated by how cute a baby is—so much so that you simply can't take care of it—that baby is going to starve.
9wnK7 TIL about Typhoon Yunya which hit the Philippines on 15 June 1991 coincided with the eruption of Mt Pinatubo.Most of the ash was blown to the west southwest over an area across the South China Sea; ash dusted parts of Indochina, more than 1,200 km away.It claimed 847 deaths & caused $700M in damages
YZ0Z TIL in 2006, Bank of America had someone jailed for inquiring about the legitimacy of a check. The uproar cost BoA $50 million worth of withdrawals from irate customers.
epErL TIL in 1973, José Luis de Jesús Miranda claimed to be the Messiah and started a church that reportedly gained 2 million followers in 30 countries. After a divorce, $46,000 in gambling debt, and claiming he was the Antichrist, he died August 8, 2013. His church denies the death and still carries on.