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Historical photos show fishermen with chinooks almost as tall as they are. A century's worth of dam-building, overfishing, habitat loss and hatcheries has cut the size of the average fish in half.

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QJYmE TIL the first person to be diagnosed with autism is still alive (87 years old)
xVmeB TIL that your teeth are actually highly-specialized fish scales
6gl TIL there is only one video of Mark Twain in existence and it was shot by Thomas Edison. [1:47] (X-Post from /r/videos)
R7GG9 TIL that for the 2015 Chinese film "Wolf Totem", 35 Mongolian wolves were trained in China for over 4 years by a Scottish trainer, who trained them to sit, snarl, and fight on cue. After filming, the wolves were ultimately relocated to Canada, since they only understood commands in English
BJvy TIL there is a sponge under Antarctica that scientists believe to be over 10,000 years old, making it the longest living organic creature known to man