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SciShow
The REAL Science of Groundhogs
Groundhogs are famous in North America for "predicting" when spring will come (and also that Bill Murray movie). But while they might make for terrible meteorologists, they actually play a valuable role in several other scientific...
Khan Academy
Khan Academy: Peopling the Americas
Many believed the first people in America came after the voyage of Christopher Columbus. We now know this to be false. There were thriving civilizations already settled on this land before 1492. This video answers the following three...