One of the coolest technologies that wasn't really designed to be as cool as it is is the friction note bill counting machine. They're used in bill payment machines at wireless internet companies, on vending machines, on some ATM machines, and with some retail cash counter machines. The reason they are cooler than they were supposed to be is the way they 'eat' the bill, slurping it up like a piece of expensive spaghetti. Sometimes with cheap vending machines they can get frustrating when they just won't take that slightly worn out five dollar bill, but the way they eat the money is still cool.
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There are also machines that work on the same principle as the vending machine money eaters, but allow lots of money to be counted at once. First, the bill is put on a hopper. Using a combination of gears, wheels and rubber bill grabbers, the machine flips the bill up behind a separator. Using either an electronic or analog sensor, the bills are tallied up. They are scanned to note down the denomination. Then the machine will give you a digital readout of the bills and denominations, giving you the grand total of what you put in the machine.
There are also machines that count the bills by weight. Instead of grabbing and sorting each bill individually, they will gauge the weight of the notes and use complex equations to sort of the variations on the bills from being used. The problem with them is they don't sort out the denominations, so if you have nine $1 and one $100 bill and the read out is for ones, the machine will tell you that you have $10 instead of $109. The nice thing about weight based machines is they are generally smaller, and fit better on desks. Both machines are faster and more accurate than counting by hand. ng each bill individually, they will gauge the weight of the notes and use complex equations to sort of the variations on the bills from being used. The problem with them is they don't sort out the denominations, so if you have nine $1 and one $100