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TIL that knocking on wood for good luck comes from ancient beliefs in tree spirits. It evolved into a gesture for luck or averting misfortune.

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6O08 TIL That there is a network of fungi (mycorrhizal fungi) that connects plants to each other at the roots. The fungi give the plants nutrients and the plants give the fungi sugar. The vast connection of plants and fungi is called the “Wood Wide Web”
vPjAr TIL: Wearing glasses used to have a negative connotation as it relates to moneylenders. This led to Hitler refusing to be photographed in glasses. However, recently glasses make individuals seem smarter and defense attorneys have since used the "nerd defense" by making violent defendants wear them.
pYAQ4 TIL that the Astrodome, the world's first multi-purpose domed sports stadium, had a gaudy apartment installed by its builder and owner, Houston Judge Roy Hofheinz
69N8Y TIL Bhutan charges a 200 USD tax per night per tourist visiting the country.
l710B TIL The British Post Office falsely prosecuted over 700 Postmasters for fraud and theft due to a faulty computer system