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TIL there is a gold fire hydrant in San Francisco that is said to have been the only functioning hydrant and is credited with saving the historic Mission District neighborhood during the 1906 quake. It is Painted with a fresh coat of gold paint each April 18

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WkLg4 TIL of an Idahoan student who made a science project about the dangers of dihydrogen monoxide (water). The project was so convincing it caused his fellow students to call for it to be banned. This was used as an argument against leading the public to false conclusions with the manipulation of facts.
JYwOB TIL that the US Food & Drug Administration keeps extending the deadline for the biggest food chains to comply with nearly decade-old federal calorie disclosure laws
4kVNw TIL when Hall of Fame pitcher Mariano Rivera retired from MLB in 2013, Hard Rock Cafe "retired" Metallica's "Enter Sandman," Rivera's entrance music at Yankee Stadium, from their playlists at all of their locations worldwide, except at their Yankee Stadium location.
kOGO1 TIL Spitting Spiders catch their prey by spitting fluid containing both venom and spider silk that congeals on contact into a venomous and sticky mass. The spiders sway from side to side as they "spit", catching the prey in a crisscrossed "Z" pattern. The entire attack lasts 1/700th of a second.
VM6rQ TIL feudalism was practiced until April 9, 2008 on one of the Channel Islands in the UK, Sark. It was a fiefdom of the larger nearby island of Guernsey and administered by a Seigneur, who was a vassal to the land's owner – the Queen of the United Kingdom, Elizabeth II.