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TIL when Max Planck began his studies in Munich in 1874, his physics professor told him to not study physics because it was a mostly fully figured out field of science with little prospect of development and only two unsolved problems.These problems ended up being radioactivity and quantum physics.

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d89VQ TIL Hitler never used the word "Swastika" let alone use the Hindu symbol. He called it the "Hooked Cross"("Haken Kreuz")
4kMvN TIL Rock paper scissors originates from Jan-ken, a Japanese variation of a Chinese game imported to Japan in the 17th century, which had a slug, frog and snake. The modern version was created in the late 19th century and spread beyond East Asia as Japan increased contact with the west
b9ogN TIL The Brothers Grimm wrote a fairytale, called The Brave Little Tailor, wherein a tailor kills seven flies in one blow and, through an amazing series of misunderstandings, becomes the king of his own kingdom.
GNK5 TIL there’s a plan to transition the US to 100% renewable energy by 2050
YVmZ TIL When Chuck Yeager broke the sound barrier, he did so using technology provided by the British to America as part of an agreed exchange of technology. After receiving the research, America subsequently reneged on the agreement and no data was forthcoming in return.