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TIL cats purr for many reasons such as when they are hungry, injured, or frightened. Purring frequencies can stimulate bone regeneration as well!

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6DRJ TIL Scientists have recently discovered repeating radio signals coming from a mysterious source well beyond the Milky Way. While one-off fast radio bursts (FRBs) have been detected in the past, this is the first time multiple signals have been detected coming from the same place in space.
1Y87 TIL Microsoft cofounder Paul Allen has found the wreckage of 1 of Japan’s largest battleships after an 8 year long search.The 73,000-ton “Musashi” was 1 of the most powerful battleships ever built. “Its discovery will… bring closure to the families of those lost."Allen said.
woZvM TIL Fireflies produce light in special organs in their abdomens by combining a chemical called luciferin, enzymes called luciferases, oxygen and the fuel for cellular work, ATP. Entomologists think they control their flashing by regulating how much oxygen goes to their light-producing organs.
ANpvd TIL only one person knows where Freddie Mercury’s ashes were buried, and she has vowed never to tell.
R7oVl TIL as recently as the 1920s, Southern California was home to massive grizzly bears sometimes exceeding 2000 lbs. They were equaled in size only by the Kodiak bears of Alaska.