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TIL a blue whale's heart can weigh in excess of 1,300 lbs and be the size of a small car. Their hearts beat at a rate of 8–10 beats per minute and can be heard from over 2 miles away.

Read more whalefacts.org

via reddit.com

b6pn0 TIL of the Mathew Effect: The rich get richer and the poor get poorer. "For whoever has will be given an abundance. But whoever does not have, even what he has will be taken away."— Matthew 25:29, Luke19:26
ZpZrY TIL After Peter Zhu was declared brain dead at 21, his parents immediately asked permission to have his sperm extracted to ensure male offspring for the family. The Supreme Court agreed, even though bioethicists argued that the request was never even made by a spouse
a8JyZ TIL about Scombroid food poisoning, which causes an allergy-like reaction to seafood. It is usually caused by improper storage/processing of raw seafood, which allow high levels of histamines to develop and cause allergic reaction-like symptoms when consumed.
Ypo8B TIL Subutai won 65 battles as general of the Mongol Empire including defeating a Russian army of 80K with only 20K soldiers. His tactics were studied by Mikhail Ivanin in the 19th century & incorporated into Russian military academies & the Red Army.
l7gyV TIL in 2017 a woman received new hands from a male donor after she underwent Asia's first upper arm double-hand transplant. To the surprise of her doctors, the limbs (which were hairier & darker) became more feminine & lighter over time, resulting in their color being closer to her own skin tone.