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TIL; Before leaving the Titanic, a second officer forgot to hand over a key to the locker - which housed the ships' binoculars. The lookouts that night later said, if they had binoculars, they would have avoided the iceberg.

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WkZ8B TIL in 1922 Raymond DeWalt invented the Radial Arm Saw, with the first saw blade driven directly by a motor. Naming it the "Wonder-Worker," he then started the DeWalt company which still exists today. Once a versatile staple of home workshops, the Radial Arm Saw is in extremely limited use today.
D14Eg TIL that Loveseats were not invented so that two lovers could sit together. Originally, they were just oversized chairs designed to allow more space for excessively wide women's dresses up until the 18th century.
o8MK TIL that beer hops contain “Hop Beta Acids” that research has shown to kill varroa mites, a parasite killing off honey bee colonies, without any affect on bees. The research has been so promising that the EPA has approved its use without further testing, due to the long history of hops in brewing.
BgJMe TIL that since sunfishes are susceptible to skin parasites, they sometimes break the surface of the water with its dorsal fin and beak to attract the attention of a gull or similar seabird. The seabird will then dig worms and other stubborn parasites out of the fish's skin.
5VM6D TIL a corpse discovered in Denmark in 1950 was so well-preserved it appeared to be a recent murder, but was later found to be 2,400 years old.