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TIL about James Christopher Harrison, an Australian blood donor whose rare plasma composition has helped in the treatment of Rhesus disease. In May 2018 he made his final donation (1173rd) at the age of 81 after having saved 2.4m babies during his lifetime as a donor.

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D7ED TIL Aribert Heim, aka Dr. Death because of the horrific experiments he performed on Jews during the Holocaust, evaded capture be escaping Germany and converting to Islam, living in Egypt under the name Tarek Hussein Farid until his death in 1992.
R7ZY1 TIL the USSR tried to blackmail a gay US journalist with photos of him having sex with a Soviet spy, but he refused to cooperate and reported the incident to the CIA. When the Soviets sent the photos to prominent journalists, they all refused to out him.
JYGAv TIL of Thales of Miletus, The first known individual to whom a mathematical discovery has been attributed. Thales used geometry to calculate the heights of pyramids and the distance of ships from the shore. He is also the first known individual to use deductive reasoning applied to geometry
4Xv1N TIL at least 43 buildings in NYC actually have their own zip code. Due to size, or amount of people who work there, or money they generate.
PYekw TIL "a low sense of control is highly associated with anxiety, depression, and virtually all mental health problems. Researchers have found that a low sense of control is one of the most stressful things that people can experience."