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TIL a Parasitoid is a parasite that kills its host

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OrOR TIL blue LEDs were not invented until the early 1990s, 30 years after red and green LEDs were invented.
LvZd TIL a 10 year old girl with cancer was too sick to see Up in theaters, so Pixar flew the DVD to her house. She died that day after watching it with her mother.
Dm6e TIL that it’s possible to sail in a straight line from Pakistan to Siberia without ever touching land.
mx9WM TIL in 2007, São Paulo introduced the Clean City Law. The result was a near-total ban of billboards, digital signs, ostentatious business signs, and advertising on buses and taxis. It turns out that some massive billboards where hiding whole favelas that few knew existed.
VMrdQ TIL that Francisco Macías Nguema, the first President of Equatorial Guinea, was paranoid of educated people, because he had failed the entrance exams to the colonial civil service three times - so he killed everyone who wore glasses, which he saw as a sure sign of superior educational accomplishment