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TIL that the Haber-Bosch process (involving formation of ammonia from nitrogen and hydrogen) that has led to a population boom over the past century, is also responsible for deaths of millions in the WWII. Additionally, almost 50% of the nitrogen found in human tissues originated from this process.

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78yNL TIL the Aztec language Nahuatl (and varieties from the Uto-Aztecan language family) are spoken by over 1 million people, some of whom only speak that language
JkZv TIL a clinical trial in 2016 held at Stanford University School of Medicine found that injecting modified human stem cells directly into the brains of chronic stroke patients can re-enable patients to walk.
R76m9 TIL Some witch hunts throughout history were likely caused by a fungus called ergot found in rye. Which is the same fungus used to make LSD, giving people hallucinations as well as painful muscular contractions, mania and psychosis. These symptoms were blamed on witchcraft.
4kvgb TIL that, from 1951 until a major incident in 1957, Lake Karachay in the Ural was used by the Mayak nuclear reprocessing plant as a dumping ground for liquid radioactive waste and now contains 4.44 exabecquerels (EBq), causing a radiation level of 600 röntgens per hour
Y7mjr TIL that we discovered the Loch Ness Monster was a hoax because of a chance deathbed confession In 1994. Marmaduke did it to get petty revenge on the Daily Mail for ridiculing him. He faked the famous photo using playdough and a toy submarine.