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TIL In 2019 a Japanese University student studying ninja history turned in an essay written in invisible ink. The words only became visible when the paper was heated over a gas stove. Her professor without even revealing the whole essay gave her an A.

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via reddit.com

D1xBr TIL toilets and drains DO NOT rotate differently in the southern and northern hemisphere
P1QpJ TIL in 2018, a UK school began enforcing a policy that banned all students from carrying backpacks after two students and a staff member were injured by students carrying book bags that were slung over their shoulders. As a protest, a student carried his books to school using a microwave.
PYvZ TIL that 2GAT123 is a license plate number used in many different movies.
Ojw6 TIL Maple syrup bottles have little handles on them because they originally came in 5lb containers that needed handles to hold, so when shrinking the bottle the handle was kept on because people associated the handle with that product.
rRQN4 TIL about the Mirlo rescue. In 1918, an U-Boat attacked a British cargo ship off the NC coast. The ship blew up, spilling oil onto the ocean which caught on fire. The US Lifesaving Service sailed through the fire 4 times to rescue 42 of the 51 aboard.