Vending Machine
How ATMs know what kind of paper bill, I'm in the machine?
In places where the paper money that you insert a vending machine, how do you know what type of bill you put in it? I just wonder. 
This is a cool question! The first generation of machines used a magnetic head, such as audio cassette players, reading ink on a ticket of dollar. Recent Readers magnetic float above the surface of the bill and can distinguish between copier ink and ink by measuring the Treasury not only the magnetic field, but the pattern of magnetic particles in the ink, which serve as a sort of fingerprint. These devices analyze also the shadows cast by various parts of a bill. Each sensor is focused on specific locations in a narrow corridor of the proposed Act as it happens. (Exactly which parts of the bill are discussed can be revealed so as not accomplices counterfeiters.)
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