TRIZ

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A gun with no sound, no heat, no explosive gunpowder, no jams, a gun that fire metal balls(projectiles) up to 8000 feet per second at a rate of 120,000 rounds per minute. Such powerful weapon should not be invented.

Innovate for peace not for war.
Link

You hold it in the palm of your hand and use it to for massaging, simple and effective tools.

So if you are doing foot reflexology don't need to use your knuckles of your hand.

New Invention play DVD movies on the go. The wearer would see images as if watching a 14-inch television screen from a distance of one meter (yard), according to an official at Scalar Corp., the Tokyo microscope maker that developed the Teleglass.