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TIL there’s a valve in fetal hearts that diverts blood away from the lungs while in utero. It begins closing at the first breath as the baby gets oxygen from it’s own lungs for the first time.

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VyED TIL the youngest Olympic athlete in Rio ‘16 was born in 2002
7rAbb TIL that Julia Tuttle was the only woman to found a major American city, having owned and developed the land that would eventually become Miami.
78wDO TIL that one of the early roles in Jodie Foster's extensive career was the voice of Pugsley Addams in a Scooby-Doo episode.
jNk4a TIL of Operation Underworld. During WWII the U.S. government worked with Mafia families to secure the country's northeastern ports. They provided protection against spies and saboteurs, avoided wartime labor union strikes, and limited theft by black-marketeers of vital war supplies and equipment.
8evO4 TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993.