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TIL of "slow television"—live, nonstop TV coverage of an ordinary event in its complete length. Slow TV was popularized by the Norwegian Broadcasting Corporation's 7-hour broadcast of the train ride from Bergen to Oslo in 2009, and a 134-hour broadcast of the MS Nordnorge's coastal voyage in 2011.

kJj0g TIL that after the initial pitch for The Walking Dead was rejected for being too "normal", Robert Kirkman revised the pitch so that the zombie virus was caused by aliens to weaken humanity before an invasion. Kirkman had no intention of ever writing this into the comic, but this pitch was approved.
BgpvD TIL that in the mid 1770s a group of English physicians took turns putting themselves into rooms that were heated up to 260F/127C to probe the limits of what temperatures humans can survive. Their research demonstrated the link between perspiration and heat regulation.
yVPJl TIL about Marie-Marguerite Duplessis Radisson (c. 1718 – after 1740) an enslaved Pawnee woman who challenged her master’s authority over her. Although unsuccessful, she was among the first enslaved people in New France to succeed in even having their case be heard by a court. She did not go quietly.
8exyV TIL that The Great Attractor. In the realm of cosmic mysteries, it is a gravitational anomaly in intergalactic space that reveals the existence of a localized concentration of mass tens of thousands of times greater than that of the Milky Way. It's pulling galaxies towards it, including our own.
E1pld TIL that the name for Russia comes from the Finnish word "Rus" which means Swede (as in "a person from Sweden"). Russians originate from Varangians (type of Vikings) originating from Sweden who later became slavicized.