On December 8, 1968, Douglas Engelbart introduced the world to the computer mouseu2014here's a look back to 40 years on input innovation.

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It has programmable buttons on it, plus a third dedicated mouse button. The buttons can be used for six different action, including zooming, panning, and rotating with its built-in gyroscope.

Most computer mice are made of plastic, glass or metal. But one vendor has done away with those materials, and created a virtual mouse beamed from a laser projector.