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TIL sharks enter a trance-like state known as tonic immobility when turned upside down. A female orca off the coast of California was observed rolling a Great White over to induce this state and was one of the first cases of predation on a Great White in the wild by anything other than a human.

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W9G4 TIL in 1988 Philly gangster Jackie DiNorscio, in the longest criminal trial in U.S. history, fired his lawyer, defended himself and through charm, wit and no legal experience, convinced a jury to acquit him and 19 other defendants of charges of loansharking, extortion, trafficking, arson and murder
P1Weg TIL about Betty Lowman, who at 22 rowed a dugout canoe ~1,300km (~800 mi) from Washington state up the British Columbia coast to Alaska, by herself, in 1937.
D1MeV TIL future Martian settlements will likely be set up inside Mars' large lava tubes. These tubes are effectively caverns with roofs tens of meters thick and with stable ambient temperature. They would protect human settlers and human technology from the extreme conditions that exist on the surface.
GAnm4 TIL After seeing its pork production decimated by flu outbreaks, farms across China have been investing billions of dollars into massive high-rise hog-raising facilities popularly known as pig hotels, with one hotel in the Southern China being 13 stories tall and meant to hold around 10,000 pigs.
gypD TIL that Yulia Volkova, co-singer of russian band t.A.T.u, despite being bisexual and supporting lesbianism, is a total homophobe when it comes to gay men.