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TIL 90 years before the invention of the modern wireless telephone, Alexander Graham Bell invented a device that could transmit speech using sunlight.

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9YkoG TIL that praising a child’s intelligence may encourage them to only engage in low-risk tasks in which their intelligence won’t be challenged, as learning takes a backseat to praise-seeking. This can last throughout adulthood. For better results, praise them on their efforts instead.
Wk4aN TIL Liquid oxygen has a pale blue color
MeKYW TIL In 1930, an 8-story building in Indianpolis was moved 52 feet and rotated 90 degrees in a month, without the occupants losing a single day of work
6EB8m TIL Lincoln repeatedly warned that British recognition of the Confederacy was tantamount to a declaration of war. Knowing a war would cut off vital shipments of American food, wreak havoc on the British merchant fleet, and cause the immediate loss of Canada, Britain was unwilling to risk a conflict
7OAL TIL that the famous Spider-man Quote “With Great Power, comes Great Responsibility,” was not originally said by Uncle Ben; it’s first appearance was as a caption.