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TIL pressure-balanced devices, which prevent "flush-toilet-shower-scald issues" became required in residential building codes starting in 1997.

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Zp9vo TIL Australia has the largest population of feral camels in the world; a 2009 cull killed 160,000 camels, about 25% of the original population
W7Jmd TIL Caxias do Sul, Brazil is home to a makeshift slum built specifically for stray dogs and cats housed by a animal rights group. With a population of 1000s, it mimics the conditions the country's most impoverished live in, even monetary restraints have caused problems with properly feeding them.
4PrR TIL that author Harlan Ellison wrote and finished his story ‘I Have No Mouth, and I Must Scream’ in a single night and did not make any changes from the first draft
Wkx94 TIL that the phrase ''Pushing The Envelope'' is not about the container for letters- but is related to a mathematical graph of aerodynamic performance on which the envelope is the boundary line representing an aircraft's capabilities.
D1JaJ TIL of the Caretaker, an artist who made eerie, disorienting music that emulates dementia and memory loss. His work, "Everywhere at the End of Time" shows the progression of a "slow death of a soul" through 6 stages.