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TIL about the water-level task, which was originally used as a test for childhood cognitive development. It was later found that a surprisingly high number of college students would fail the task.

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rRMW0 TIL The percontation mark ⸮, sometimes called the 'irony mark', was a 16th-century suggestion for indicating a rhetorical question. Who knew⸮ Could we have messed this up any more⸮ etc.
P115e TIL in 1775 South Carolina had a Northern part and Southern part with Georgia right in the middle.
JnDk TIL that Abraham Lincoln arrested pro-confederate members of Maryland’s legislature as they were headed to a vote on whether Maryland would secede from the Union, in order to prevent Maryland from seceding.
8elKK TIL: The first item/invention to break the sound barrier was the whip. The cracking is a sonic boom.
vPl9B TIL , The Legendary Last Stand at Rezang La(1962) At 18,000 Feet, 120 Indian Soldiers Fought to the Last Bullet, Killing 1,400 of the 5,000 Chinese Troops in the process. Despite having outdated WW era guns.