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What's in your wallet?

People carry money about, save it, and spend it, but often know almost nothing about it.

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I teach biology at a college here in Maine. Sometimes the lessons proceed in unanticipated directions.

This is exactly what happened recently during a laboratory exercise. The topic was taxonomy – the classification of living things. Using American money as an example of how things are logically ordered, I asked my students to write a classification scheme that would divide the various denominations into groups with related features. "Think of characteristics shared by different coins and bills," I instructed. "For example, the coins have a Latin motto."

What Latin motto? Most had never heard of a Latin motto. So I told them to take out a coin and look for something that wasn't in English. They found it, but it was as if they had never seen it before. "E Pluribus Unum." Out of many, one. A beautiful motto. One of the best. It certainly has more gravity than Aruba's motto, "One Happy Island."

My students' lack of knowledge about the national motto piqued my curiosity. I told them to put their money away. Then I took out a handful of change and a few bills. "Who's on the penny?" I asked. Most of them knew that it was Lincoln.

Then I asked the next logical question: What's on the back of the penny? Two people said, "A house." Not one of the 20 named the Lincoln Memorial.

All right, then. On to the nickel. Who's the guy on the nickel? Two people got Jefferson right, but none of them knew what was on the back of this coin: Monticello. My biology laboratory was quickly becoming a lesson in numismatics, US history, and literacy.

"Don't you folks ever read your money?" I chided.

One replied (and I should have seen this coming), "No, we just spend it!"

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