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TIL Chicago sets its rail tracks on fire to prevent icing

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Z8elY TIL: Like all male Swiss citizens, Roger Federer was subject to compulsory military service in the Swiss Armed Forces. However, he was ruled "unsuitable" due to an unspecified injury. Instead he served in the civil protection force & was required to pay 3% of his taxable income as an alternative.
OGbE6 TIL one of the leaders of the NAACP in the early 20th century was Walter White. Who was able to pass as white and protect himself during tense situations in the 20s and 30s.
Vewp TIL Most greenland sharks are blind due to a 3cm long parasite that latches onto their eye. The sharks have not evolved a defence because the parasite is bioluminescent and is theorised to attract prey to the shark’s head
awN6b TIL Some Louisiana Science Textbooks Used in Louisiana Schools Say That Scientists Think Dragons (Fire-Breathing Dinosaurs, technically) May Have Existed and That Humans Lived Alongside Dinosaurs
loeOK TIL the NHL is Canada's National Hockey League. The first US team didn't join until several years after it was established.