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TIL of the ABC TV show Turn-On, which debuted February 1969. The first episode was so bad, one affiliate refused to return to it after the commercial break. Several west coast affiliates refused to air the show at all. Before the first episode had finished playing, the show was cancelled.

oBKrL TIL the underbelly membrane of lobsters is the toughest material of all natural hydrogels, including collagen, animal skins, and natural rubber. The membrane is about as strong as industrial rubber composites, such as those used to make car tires, garden hoses, and conveyor belts.
68Z8 TIL of a Romanian Princess who opposed the alliance with Germany during WWII. She personally took custody of surviving Allied crews who were bombing her country, saw that they were cared for in her hospitals, and facilitated their escape to Italy. She helped more than 1000 US crewmen shot down.
X0DpQ TIL that according to the Oxford English Dictionary, the term "grandfather clock" originated from the popular song "My Grandfather's Clock", written in 1876 by American composer Henry Clay Work.
Ooo67 TIL months before D-Day British Commandos drove a ship full of explosives on a delayed timer into strategically vital shipyard. Most were captured but 5 walked back to Spain. During interrogation, a German Officer told one of the Commandos the damage would be fixed in weeks, right before detonation.
neMyB TIL that the new Grand Egyptian Museum will be the largest archeological museum in the world.