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TIL that in Iceland alone there are 111 'Blood farms' - that forcibly extract huge quantities of blood from pregnant mares - horses. The blood is used to create a hormone (PMSG) that is given to factory farm pigs to increase the size of their litters.

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9wpG7 TIL Thomas Edison controlled most of the film industry in New Jersey which annoyed smaller independent producers and filmmakers. They retaliated by moving their independent films to Hollywood, and eventually became Universal, Paramount and 20th-century Fox.
698gY TIL about the Doorway Effect, where the simple act of walking through a doorway (both physical and virtual) can cause us to forget what we were just doing.
LkP6m TIL that your voice can change during different phases of the menstrual cycle due to the link between hormone levels and vocal cord functions.
b9pV9 TIL of Joseph Trombino, Brinks truck driver, who narrowly survived an armed robbery in 1983 and the World Trade Center bombing in 1993, only to be killed in the World Trade Center on September 11, 2001
W7GP8 TIL that General Patton as a young officer competed in the 1912 Olympics in Pentathlon where he came in 5th, mostly because he insisted on using his own .38 service revolver for the shooting event and left such large holes in the target that it could not be determined if all of the rounds had hit.