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TIL of the Trachtenberg speed math system used to multiply large numbers in your head. It was developed by a Jew, Jakow Trachtenberg, while being held in a nazi concentration camp. He developed this technique as a distraction from the horrors surrounding him.

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kO6v1 TIL about vanity sizing, which is the practice of assigning smaller sizes to clothing to flatter customers and encourage sales. For example, a Sears dress with a 32 inch (81 cm) bust was labeled a size 14 in the 1930s, a size 8 in the 1960s, and a size 0 in the 2010s.
9Y6w7 TIL The crew of Planet Earth II filmed the mass birth gathering of Saiga Antelope, only to witness a disease spread and wipe out more than 150,000 antelope within 3 days.
Z8AQY TIL Researchers fashioned a scar on female subjects before their interactions with a stranger. Unbeknownst to the women, the scar was removed before the face-to-face conversation with the stranger. Nevertheless, the women said the stranger had stared at the scar and made them uncomfortable
b6BQ9 TIL before Fred Rogers passed away on the morning of February 27, 2003. His wife was present to comfort him as he was dying. His last words was "Do you think I'm a sheep?" (referring to Matthew 25). After passing away, Joanne reassured him by saying "Fred, if ever there was a sheep, you're one."
a7No TIL emotional crying is the result of very high levels of stress hormones building up in your body. Crying releases these hormones, resulting in feeling of relaxation and security.