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TIL of Vedem, a Czech-language magazine produced in 1942 by boys aged 13-16 imprisoned at the Terezín concentration camp. The magazine featured things like poems, drawings, essays, and reviews, and was manually copied and distributed around. Around 800 original Vedem pages survived the war.

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R7n0j Humpback whales are far better known for their bellowing "songs" that can travel up to six miles, but the animals also have quiet voices. Biologists have observed humpback calves “whispering” to their mothers in tones that can be heard only within 330 feet—a strategy to prevent predators, such as orcas, from eavesdropping. Calves also want to avoid adult male humpbacks, which may try to separate the calf from its mother to mate. This shortened time with its mom could ultimately weaken the calf, which needs to drink 50 gallons of milk a day to fuel up for its long migration.
78VKO TIL that avalanche airbags are a thing. There's a special backpack with a cord you pull to inflate it when an avalanche hits while you're skiing/snowboarding, etc
ADKYo TIL in 1987 director John Landis was acquitted on 3 counts of involuntary manslaughter after actor Vic Morrow and two children aged 6 and 7 were decapitated on the set of The Twilight Zone movie in 1982.
VBXR4 TIL about the Huolongchushui: A dual-stage ballistic missile fielded by the ancient chinese navy in the 14th century, during the ming dynasty.
E1Rm7 TIL that most of the water scenes in the titanic were filmed in a large pool.