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TIL Harley Quinn was created for Batman: The Animated Series, and didn’t appear in the comic books until two years later

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Wk9OB TIL that in Roman mythology Cupid shot Apollo with an arrow and he fell in love with this chick Daphne but she wasn't into it so she turned herself into a tree. Happy Valentine’s Day!
RPB8 TIL that the Maleo, a large bird endemic to the Indonesian island of Sulawesi, uses the heat from the island’s volcanoes to incubate its eggs. Maleo chicks are totally self-sufficient and can fly almost immediately after hatching.
womYJ TIL: Octopuses have three hearts: two pump blood to the gills for oxygenation, and one circulates oxygenated blood to the body. This helps them thrive in low-oxygen environments, like the deep sea.
16xb4 TIL a study published in 2017 found that children who were breastfed for two years or longer had a 2.4 times higher risk of having severe cavities, compared to kids who were breastfed for less than a year.
VMbV4 TIL people really do have a "type" when it comes to romantic attraction. According to a study, 50% of people’s preferences for faces is unique to them, and who we find attractive is most strongly influenced by our life experiences.