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Arsenic was widely used as a medicine in the 19th & 20th centuries. The development of forensic toxicology coincided with the spread of mass-produced & commercially distributed medicines & poisons, & an associated rise in murders & suicides involving those substances.
A woman weeps during the deportation of Jews from Ioannina. Greece. on March 25, 1944. The deportation was enforced by the German army. Almost all of the people deported were murdered on or shortly after April 11, 1944, when the train carrying them reached Auschwitz-Birkenau.
Britian's first serial killer - Mary Ann Cotton. She poisoned 21 people including her own mother, children and husbands.
Climbing the pyramid of Cheops around 1900
Joseph Vacher murdered 11 people from 1894-1897. His murders frequently involved castration, raping the corpses (both male and female), and removing entrails and sexual organs. He wrote a sickeningly detailed confession after he was arrested, but offered every conceivable excuse for his murders. He was guillotined in 1898.