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TIL “beehive fences” (spaced along the edge of their property) in Africa help farmers ward off elephants without harming them, while also producing honey that they can sell in addition to other crops.

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75Op TIL a Superman radio series called ‘Clan of the Fiery Cross’ that exposed the secrets of the KKK and made its members feel foolish, at the same time driving recruitment to zero
vPbaj TIL that even enemies of the Aztecs who were chosen for sacrifice understood their role to be sacrificed to the gods, because they practiced the same religion. Victims were expected to greet passerby, bless children, visit people in their homes, and even lead sacred songs, processions, and dances.
9YeVm TIL Beneath the streets of Cincinnati OH is the largest abandoned subway tunnel system in the US. Construction began in the 1910s but was halted by WWI and then canceled indefinitely during the Great Depression.
P1N0V TIL after realizing their tail-warning radars had the opposite effect - attracted luftwaffe to their night raids rather than increase survivability - The RAF decided to abuse this fact to intentionally lure german aircraft into deadly traps using their mosquito night fighters
X0r6X TIL Thomas Knoll built an image processing program to help with his Ph.D. work. With inputs from his brother John, he built a software package. Initially, they licensed the distribution rights to Adobe & 7 years later (in 1995) sold the rights to Photoshop for $34.5m. Thomas never finished his Ph.D.