Issue Date: June 11, 2007
SAY YOU'VE BOUGHT a soda with cash, and the store clerk hands you a $5 bill with your change. You probably stick it right in your wallet without a second glance. But what if it's a $100, or even a $20? Do you pay attention to the feel of the paper? Do you hold the banknote up to the light to check for an embedded plastic strip? Do you tilt the bill back and forth, . . .
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