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TIL there are trees in Florida that are so deadly that even standing under it in the rain is enough to cause blistering if the skin is wetted by raindrops containing any sap. Additionally, if one of these deadly trees is burned, the resulting smoke can cause blindness if it reaches a person’s eyes.

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6EQ5Z TIL of Russia's "Dead Hand" (aka "Perimeter") automated nuclear defense system. If a large spike in radiation levels was picked up within Russian borders (indicating nuclear detonation), the system would target many different cities and launch nukes. It is believed to still be active.
W7Q6X TIL the artist Rembrandt, despite living in the 17th century, owned a Samurai Helmet. This was due to the Dutch being the only country allowed to trade with the Japanese
VBMQB TIL that much of what we know about narcolepsy comes from studies of Dachshunds, who can experience narcoleptic fits due to the excitement of receiving yummy tinned food
DGmj TIL in response to an interview where Huey P. Newton, co-founder of the Black Panther Party, was asked what white people could do to support the Black Panthers, he replied that they could form a White Panther Party. The WPP was founded thereafter.
1Wvr Today I Learned that Niagara Falls fell silent one day in the 1800’s, the water just stopped flowing for 30-40 hours. This happened late at night and those who lived near the falls were very surprised with how erie silent it was all of a sudden.