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TIL that Olympus Mons on Mars, the tallest known mountain in the solar system, is so large at its base that an observer on its peak wouldn’t know he was standing on a mountain because its slope would be obscured by the curvature of the planet itself.

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DWRr TIL a platinum weight kept in a French vault that defines a perfect kg keeps experiencing minor fluctuations in mass. Now a perfect crystal sphere that took two years to polish and has a fixed number of atoms is being developed as the new standard
4djX TIL that in Switzerland a seven-member Federal Council serves as the collective head of state, with each member leading an executive department. The current council consists of four men and three women from five different political parties.
5PJk TIL that the first school shooting to happen in the United States was the Enoch Brown school massacre, in which 2 Delaware (Lenape) American Indians broke into a school where they shot and scalped the students and their teacher. 4 others were taken prisoner.
ZeX4 TIL that actor Jack Nicholson didn’t find out until his mid thirties that his “parents” were actually his grandparents and his “sister” was his mother
ZpMdp TIL that the only piece of acting Jack Nicholson did since 2010 was for 2019 video game Trover Saves the Universe, where he voices a tree. The voice was recorded by Justin Roiland, the game producer, at Nicholson's house and is featured in the game as a part of an Easter egg, still to be found.