I found this website about a year ago, forgot about it, and then remembered it again recently when I got a couple of dollar bills with the where's george? stamp on it.

www.wheresgeorge.com

It's pretty cool. You can register for free. You enter the year and serial number of a dollar bill and see where it's been, and later on if someone else enters the same bill, where it's gone after you used it. Sometimes your money gets hits, other times it doesn't. It's just pretty cool and worth checking out if you haven't already seen it.
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