Though the histories and cultures of indigenous people are often lost, the evidence they've left behind might be closer than you expect. In this episode, the boys share information on Native American mounds - some of which are practically in their backyard.

And what would our show be without making fun of how stupid old-timey people were? No, really... In the case of this week's European Americans (including one well-known national hero), they were VERY stupid.

Click here to learn more about Serpent Mound.