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TIL that the original voice actor for Mermaid Man, Ernest Borgnine, was a recipient of the Academy Award for Best Actor.

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NjRE TIL in 2001 a man wrestled a 7-foot bull shark to retrieve the severed arm of his nephew. After saving the boy the man dived back in, seized the shark and wrestled it to shore where a ranger shot it. The arm was pried from its gullet, put on ice, rushed to the hospital and successfully sewed back on
1aR8r TIL that just about 90 years ago, humans believed that there's only one galaxy (ours) that's surrounded by infinite dark space. Today we know there are at least 400 Billion galaxies, some visible to the naked eye.
8a8rb TIL the Demon Core was a piece of plutonium intended to be used in a third atomic bomb to drop on Japan... due to lax saftely standards, its criticality was being regulated with just a screwdriver, and two physicists were killed maintaining it
n6w7 TIL a 2012 study by Tampere University of Technology found that, with energy efficiency improvements, a single household could decrease its energy consumption by more than 40%
J1DB1 TIL of brain tanning, a traditional method of tanning leather using animal's brain matter and smoke, that was practiced by Native Americans, Saami and other indigenous cultures