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TIL that when the character Batwoman was first introduced in 1956, it was to give Batman a love interest after accusations of his homosexuality. When Batwoman was reinvented in 2006, she was explicitly a lesbian.

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Wk804 TIL Scientists tracking the migration of swifts discovered they can stay airborne for 10 months straight without ever landing. Of those birds that did land, they still spent 99.5% of their ten months in the air.
E17wx TIL that the ISS or the International Space Station at an average altitude of 400 kilometers/248 miles above Earth and circle the globe every 90 minutes at a speed of about 17,500 mph or 28,000 km/h.
D1ydJ TIL jellyfish are related to corals. They are both part of the cnidarian family, which contains organisms with a special cell (called a nematocyst) specifically evolved for stinging. This cell is no longer used by corals, however.
KvvE TIL That 167 people cashed in big on 175 to 1 odds that Luis Suarez would bite someone during the 2014 World Cup after a Norwegian betting site posted a joke bet.
DYde TIL that a librarian found smallpox scabs stored inside a 19th century medical book. In the 1800s scabs from infected people would be inserted into healthy people as a means of vaccination. These scabs have the potential to shed light on The evolution of the small pox vaccine used in the Us today.