Computers would be useless without input devices. Even small-scale
             computers from calculators to GPS navigation systems require some input
             from the human being in order to work properly and produce worthwhile
             output. Some of the everyday input devices like keyboards, mice, joysticks
             and microphones have reached increasingly more sophisticated levels of
             technology. Other input devices that are available to the general public
             but are generally used in commercial settings include touch-screens,
             keypads for ATMs and bank card purchases, credit card scanners, bar code
             readers, and more. However, new technology is constantly being developed to
             create ever more sophisticated and futuristic input devices. Some of these,
             like the digital signature capture pen and 3D body scanner, may never make
             it into the common household but are nevertheless fascinating new
             developments in technology. They enhance the ways in which human beings can
             interact with machines. Some other new input devices discussed in the
             Popular Science online magazine include touch screen GPS systems, fancy
             digital music centers that operate independently from the PC, and the most
             outlandish: the wearable computer. The wearable computer is mostly a thing
             of fantasy but baby steps will continually be made to eventually enable the
             entire human body to potentially interact with a computer.
             The portable navigation systems currently out on the market are very
             helpful for drivers, hikers, and campers. They usually require the user to
             input coordinates in a cumbersome manner, by scrolling down a list and
             manually inputting navigational points of reference. This tedious process
             has been recently made more streamlined by the introduction of the touch
             screen GPS system. However, this is really no different from the technology
             used for touch screen computers; the difference is in the output of the
             The advances in digital music...