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TIL that weeping willows, and almost all other weeping trees, are cultivars. Humans propagated mutated trees for their beauty. There are no true species of weeping tree; they are all growth forms of upright trees.

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0dXxL TIL that in 1960, the USA all by itself accounted for 40% of the entire planet’s GDP
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eepD TIL that Albert Einstein worked as an electrician on the Oktoberfest 1896.
wLZdY TIL Facebook applied for a patent for a technology built to spy on users' reactions of content through their webcams/smartphone cameras and microphones without their knowledge
KOJw6 TIL Mixing moss with yoghurt creates a "growing paint" you can use to paint moss on things.