How Do Vending Machines Tell the Difference Between Fake Coins and Real Coins?

One of my life dreams as a child was to be able to fool a vending machine with quarter-like objects. I mean, how smart could a vending machine be, right? Wrong. More like how dumb a kid I was. Vending machines use light sensors to measure the size of a coin and electromagnets to detect the metal type to determine what…

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