If you'd prefer a more accurate and less misleading introduction to money, you can try these Yale video lectures:
http://oyc.yale.edu/economics/financial-markets/
Specifically, these lectures:
http://oyc.yale.edu/economics/financial-markets/content/sess...
http://oyc.yale.edu/economics/financial-markets/content/sess...
Or Paul Krugman's article on the gold standard: