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TIL a young woman's head swelled from her usual measurement of 22 inches to 24.8 inches (and the shape of her face changed) after she used hair dye. This was because the hair dye had a chemical in it called PPD (paraphenylenediamine), which can cause serious allergic reactions in certain people.

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nWV6Y TIL that heavy metal pioneers Black Sabbath have played with some of the most iconic vocalists in rock history, including Ozzy Osbourne, Ronnie James Dio (Dio, Rainbow), Ian Gillan (Deep Purple), Glenn Hughes (Deep Purple) and Rob Halford (Judas Priest).
NX8g1 TIL: That in 2012, a Dutch World War II memorial was revealed on which the names of Jewish, Allied and German military deaths were written alongside each other in Comic Sans. The names were eventually scraped off following complaints, only for the rewritten message to also be written in Comic Sans.
OOE1 TIL Three men from Yemen sued NASA for trespassing on Mars. They claimed that they inherited the planet from their ancestors 3,000 years ago.
4kyE6 TIL that Max Planck, the father of quantum theory, lost his son, Karl Planck, in 1916 during World War I. Karl, who was serving as a lieutenant in the German army, was killed in the Battle of Verdun by French forces.
a8VRy TIL The dueling pistols used by Aaron Burr and Alexander Hamilton are owned by J.P. Morgan Chase.