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TIL The square root of -1 exists and it’s called an “imaginary” number

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via reddit.com

R5a1a TIL co-founder of the band ABBA, Anni-Frid Lyngstad, was born from the union between a Norwegian mother and Nazi German father for a program where the Nazis tried to increase the Aryan population. Children such as her were open to receive nicknames such as “SS bastard”, “rat,” or “Nazi child.”
rp9x TIL That the Mars Rover, Curiosity, leaves Morse Code tracks that decode to say “JPL”. The lab that created the rover.
R5rxQ TIL that even after the atomic bombings of Hiroshima and Nagasaki, with Japanese leadership still in disagreement over surrendering, the Allies executed the largest and longest bombing campaign of the Pacific War, with 1014 aircraft used.
RAGj TIL the inventor of the Rubik’s Cube didn’t realize he’d built a puzzle until he scrambled it the first time and tried to restore it
pYGab TIL that the global tree canopy increased by 2.24 million square kilometers (865,000 square miles) between 1982 and 2016