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TIL that Father's Day was first celebrated in Washington state in 1910 but wasn't declared a nationwide holiday in the US until 1972, 58 years after Mother's Day became official.

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VBAl8 TIL Swedish mass-immigration to the USA began in the mid-1840s and peaked in 1887 with over 46,000 registered emigrants that year. Out of the 1.3 million Swedes who emigrated to the US, approximately one-fifth returned to their homeland
epaxn TIL about a batman, an individual assigned to a commissioned military officer as a personal servant. An officer's batman was also responsible for the officer's "bat-horse" that carried his kit during campaigns before cars were invented. The term also predates the superhero Batman's appearance.
R59a4 Today I learned that there are 6 ongoing major wars, 15 ongoing (medium-sized?) wars, 20 ongoing smaller conflicts, and 15 ongoing skirmishes/clashes
m1nwY TIL that Japan has "fishing restaurants" where you catch fish right in the restaurant and the chefs will cook it for you right away!
xMP5 TIL that Titan’s atmosphere is denser than Earth’s, with 1.45 times the surface pressure. The atmosphere is so thick and the gravity so low that you could play planes very very easily, and even humans can fly there by attaching ‘wings’ to their arms and flapping.