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TIL Hobos use symbols to communicate to other hobos

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bYDQ TIL that in 2006, a man escaped from a US federal prison by mailing himself out
yVWla Today I learned that if you collapse an underwater bubble with a sound wave, light is produced, and the mechanism has not been figured out.
1aW77 TIL the Iroquois Theater in Chicago was billed as "Absolutely Fireproof" in advertisements when it opened. It lasted 37 days before being destroyed in what is still the deadliest single-building fire in U.S. history, leaving 602 dead and 250 injured.
VMwQG TIL on the Korean island of Jeju there is a community of women divers (Haenyeo) who carry on a centuries old tradition of free diving for seafood delicacies. Now declining in numbers due to commercial fishing, most Haenyeo today are between 60-80 years old and have been diving over 50 years.
YAEr TIL In the early 90s, shortly after Crystal Pepsi was released, Coca-Cola developed a clear version of their Tab cola. However, they intentionally developed it to fail so as to taint the reputation of and take down Crystal Pepsi in an act of kamikaze.