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TIL rats who were trained to press a lever for their food would stop pressing the lever once they saw that it would electrically shock other another rat

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e0Amk TIL about an unnamed Viking warrior who was tasked with guarding a narrow (4 person wide) bridge against the Saxons in 1066. He survived constant attack for 1 hour until a clever Saxon floated down the river in a barrel and piked him in the groin from under the bridge.
R7Dkj TIL that the last official sword duel took place in France on the 21st of April 1967 because a parliament member called the mayor of Marseille “a dumbass” during a parliament conference
9YKjp TIL that in order to gain more information on the capabilities and location of American missile submarines the Soviet Union used specially equipped fishing trawlers to spy on American naval activities.
5VPDn TIL of Joice Heth who, in 1835, was sold to PT Barnum and took on tour and displayed as the 161-year-old nurse of George Washington
16yZ8 TIL that in the music video for Status Quo's "Rockin' All Over The World", bassist Alan Lancaster is replaced by an obvious dummy, because he wasn't available for the shooting.