In the 1700s, fossil finds along the Ohio and Hudson Rivers indicated that North America was home to mysterious beasts. Learn how mastodon bones proved both that extinction is real and that America isn't full of degenerates in this episode of BrainStuff, based on this article: https://animals.howstuffworks.com/extinct-animals/mastodon-boneyard-that-stole-thomas-jeffersons-heart.htm

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