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TIL the SR-71's sonic boom was used to "remind [heads of state] that they were doing things that were counter to US policy."

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5YnQk TIL the goat is the Navy mascot partly because sailors used to leave goats on remote islands to propagate and become a source of food for passing ships - a practice which caused long-standing environmental issues due to the introduction of an invasive species.
ba60 TIL of Katinka Hosszu, a Hungarian swimmer who failed to medal at her first two Olympics, got fourth in her third Olympics, and finally at her fourth Olympics won three gold medals
nPgo TIL The Number of the Beast (666) may have actually be a mistranslation. The actual Number of the Beast may actually be 616.
PYaKZ TIL in some areas leopards commonly hunt dogs. They will even carry off dogs much larger than them, such as the Tibetan Mastiff and Newfoundland, that are used to protect from them. Iron collars are sometimes used to protect the dog's necks so they have a chance of surviving the initial attack
8a7oZ TIL that Louis Armstrong wore a Star of David pendant for most of his life, up until the day he died, to commemorate a Jewish family that had taken him in and cared for him as a child.