Photodielectric discovery brings new optical control to electronics

Characters in some of the more futuristic science fiction films, like "Minority Report" and "Iron Man," control computer displays with slick and deliberate hand motions. In "Minority Report," the protagonist, played by Tom Cruise, uses gloves that glow at the fingertips and give him the power of virtual manipulation. The light seems to allow him to control the screen as if it were a touchscreen, but he's touching nothing but air.

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