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Currency Bill TrackingThere are a number of websites that track migrations of currency bills (just like ornithologists track migrations of birds by ringing them). All these sites can track currency among the users of that website. A user may register a bill by entering its serial number, and if someone else have already registered the bill, then the "route" of the bill can be displayed. Some sites encourage marking before spending, others don't. This usually depends on the laws of the country issuing the currency. Some of the websites for bill tracking: The act of tracking a $20 bill was the binding theme between various stories in the film Twenty Bucks. A similar scheme is BookCrossing, which tracks the movement of secondhand books which are marked and then "released into the wild". See Also:Bookcrossing, Geocaching, Letterboxing, External links
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