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TIL: Baseballs used in MLB have been rubbed with a special mud from a secret river in New Jersey for over 75 years to comply with a rule that all baseballs must be "properly rubbed so that the gloss is removed".

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via reddit.com

dDYE7 TIL an embryo conceived in 1992 was thawed and resulted in the successful birth of twins 30 years later
0w0R1 TIL that videogames have been found to be more effective at battling depression than therapy.
gMjJ8 TIL of the Treaty of Canandaigua between the USA and the Iroquois in 1794. Article 6, requiring the US to provide $4500 in goods every year, is honored to this day, but Article 2, protecting the land of the Oneida, was mostly ignored and their land fell from 6,000,000 acres to just 32 acres in 1920.
lo5EV TIL Prince Pedro of Portugal fell in love with his wife's maid, Inês de Castro. After his wife died, his father, King Afonso IV, desired he remarry but not to Inês. Pedro refused; so, the King had Inês killed. Pedro captured two of her killers and publicly executed them by tearing out their hearts.
16oZX TIL that Jodie Foster's brother wrote a tell-all book in 1997 in which he outed their mother and also implied Jodie was gay (she came out decades later in 2013)