If you grew up in the United States, you've doubtlessly learned all sorts of stuff about Thomas Jefferson -- but did you know about his bizarre fascination with mastodons? It's a winding tale of nationalism, naturalism, and good old American rivalry with the French. And the guys aren't diving into this one alone: they're joined by returning guest and veteran podcaster, the legendary Lauren Vogelbaum, to learn more about the story in part one of this special two-part series.