Favorite episodes? Planes, Trains, maybe Automobiles???

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There have been so many Modern Marvels episodes over the years. Are there any particular shows that have made you interested or more curious about that subject matter? If so, why? My favorite was the U.S. Currency. It was interesting to see the beginnings of the Federal Reserve, and more importantly, the U.S. Mint. It was good to learn about the problems with counterfeiting, the lack of uniformity within the colonies in the beginning, and the new ways they are trying to prevent counterfeiting (i.e. watermarks, special paper, colors, etc.) The U.S. bank note has come a long way from its early beginnings in an old tavern in Philadelphia.