Where's George? ® 2.4 -- Track Your Dollar Bills

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When you enter the bill you found, you will get back a list of all the cities, states, and countries where that bill has been recorded, as well as travel time, distance and speed of each step along its journey. You can start and enter your own bills to track! You will need to Register before entering your own bills so you can be notified when your bills are found next.

Full article: http://www.wheresgeorge.com/