What really amazes me is the "smartness" of vending machines, or any cash-receiving machines for that matter. How can they tell what denominations are the bills you insert? I've always wondered how these machines tell the difference between a ONE or a FIVE? It's easy with coins since they're different sizes, different weight. But bills? They feel the same; they are the same size, same color, almost same everything. Those machines are darn smart. You can never try to outsmart them and trick them into thinking that you've inserted a TWENTY when you only inserted a TEN. Maybe someone can shed some light this way?!
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