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TIL scientists determine a blue whale's age by counting the layers of it's earwax.

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ADY6o TIL Sperm whale sonar clicks are so loud they can do physical harm to divers.
wL5AY TIL, Tommy Wiseau's 'The Room' became the first movie ever to be shot in both 35 MM film and HD simultaneously
W598 TIL, Theodore Roosevelt referred to Thomas Paine, who came up with the terms “United States of America,” as a “filthy little atheist.”
woXe8 TIL in the 1970s, France acted as Saddam Hussein's "chief arms broker"; they sold $25billion in weapons to Iraq of which most was advanced fighters and missiles (close to $100bil in today's money)
nWWxr TIL that the remains of over 4000 Confederate Soldiers who died while Prisoners of War are buried in Oak Woods Cemetery in the Hyde Park neighborhood of Chicago, Illinois. A 30 foot tall monument marks their mass grave.