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TIL that Groundhog Day was introduced to America by German settlers who originally used a hedgehog to predict the weather, switching to the groundhog as they were easier to come across in the Keystone State.

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via reddit.com

PYM1J TIL humans live closer to the time of the T-Rex than the T.rex lived to the time of Stegosaurus
JYVm1 TIL Blue whales eat half a million calories in one mouthful
8BMG TIL some cooperative bottlenose dolphins off the coast of Brazil help fishermen - having signaled with head and tail slaps to the fishermen where to drop nets, they corral the fish toward into them and eat the fish missed by the net.
xVlg TIL a local radio DJ vowed to stay on air until the Orioles won a game during their longest losing streak on record, 21 games. He was on air for 11 straight days, and despite developing health issues, slept only during songs!
XVPk TIL: That a third of people have a “Photic sneeze reflex” where they sneeze when they are exposed to a bright light.