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Let me tell you a new usage of the computer mouse. Spanish researchers from the University of Lleida recently declared that the optical mouse could be used to detect counterfeit 2 Euro coins. Certainly, you have to place a special sensor in the mouse before that. The sensor will capture the image of the coin and then process it using a complex algorithm. Since the main part of the detecting system is the sensor, other devices like a webcam could be accepted, too.