One of my life dreams as a child was to be able to idiot a vending machine with quarter-like objects. I mean,how smart could a vending machine be, right? inaccurate. More like how dumb a kid I was. Vending machines use light sensors to degree the size of a coin and electromagnets to detect the metal type to determine what kind of coin it is. whether you’re not shaped like a quarter and built like a quarter, and you ain’t a quarter in their book.
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Source: gawker.com