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TIL multiple studies have indicated 3rd-cousin relationships to be the “genetic sweet spot” for maximum human offspring fitness. Richard Dawkins has even discussed the concept in his literary works

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via reddit.com

KO6mG TIL that the city of Holland, Michigan, has 168 miles of tubing coiled underneath its streets, circulating hot water in order to melt any snow on the ground.
oBeBR TIL that tattoo pigments can be transported through the lymphatic system and deposited in the lymph nodes where it then stains the lymph node tissue. This effect was observed in tissue samples taken from cadavers.
Bra0x TIL the phrase "Low Man on the Totem Pole" has come to mean the opposite of what it should; the "Low Man" on the totem pole was often the most talented and valuable part of the totem pole creation process.
Lkrem TIL: The Australian iconic kingfisher, the kookaburra was introduced to New Zealand, released on Kawau Island, and although rare can be found in the surrounding area, in the north of the North Island
R5Drl TIL Jaguar Cars were known as SS Cars until 1945, after which they changed their name for obvious reasons