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Today I Learned that Billard balls used to explode often because they were made of celluloid.

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NX4rN TIL the Wampanoag and other tribes of the Eastern United States hold an annual demonstration every Thanksgiving called the Day of Mourning, to raise awareness toward historical and ongoing struggles facing Native American tribes.
4kRYb TIL that falling asleep while on watch duty during a war time could result in death or other lawful punishment according to the article 113 of the Uniform Code of Military Justice (UCMJ).
0rLv TIL When developing the Macintosh computer, Steve Jobs wanted to add a small mysterious character who would appear after about every 1000 times you used an OS UI element. He would wink at you and disappear so fast that you wouldn’t be sure he was real.
kJv17 TIL the entire continent of Europe has a smaller economy than the United States, $23 trillion compared to $25 trillion, despite having over twice the population, 745 million compared to 333 million
nmOB TIL Navy SEALs used to be waterboarded as a part of their training but the process was stopped when no SEAL could pass it, leading to bad morale.