We had an interesting, but short discussion in 6th period AP Government about U.S. currency and that it used to be backed by gold, but now it's backed by nothing but our faith in the U.S. Government. About a year ago, the NPR podcast Planet Money (which I cannot recommend enough - it's absolutely brilliant) did a story explaining why gold wound up as the most desirable precious metal for money. It's a cool story, and contains a lot of chemistry info.
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