If you believe the FBI, American companies lose around $250 billion a year due to counterfeiting. That's a lot of spurious scratch floating around. With the Authenticator Detector ($299), you can avoid the embarrassment of getting caught trying to hawk a bogus Benjamin. Using an algorithm that automatically checks for infrared, ultraviolet, visual, and magnetic-ink properties, the device can identify even the best counterfeits in less than 2 seconds. The authenticator can be used with all US dollar denominations as well as euros and Canadian dollars. — Trevor Noren