Some facts you may not know...
From Gizmodo -- That single that's been wadded up in your front pocket for the last two weeks? You're just a way station, my friend. Because it's seen and done more than you could ever imagine. Here's its secret history. The biggest surprise? Trace amounts of cocaine has been found on nearly every dollar bill in circulation. And its average life cycle is only 21 months. And they churn out over 16 million a day.
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Video: How Money is Made - Part 1