The technology is not limited to detecting movement within camera view - it detects natural hand movements that extend beyond the camera, surrounding a device screen.

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About a third of a mile from the canyon top, we came upon a 150-foot natural rock arch with a keyhole view of the river far below.

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As with its view of the U.S., the commission takes a pessimistic view of the natural unemployment rate in recession-hit countries such as Spain and Ireland, where it see the natural rate at over 18% and 12%, respectively.

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The natural, bright viewfinder offers a horizontal field of view of 25-degrees, allowing users to scan the entire scene quickly and easily.

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By improving the sensors that capture imagery and filtering results, a human user who is wearing an EEG cap can then rapidly view the filtered image set and let the brain's natural threat-detection ability work.

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But the usual causes of natural variability do not seem to explain the current trend, so scientists incline to the view that it is man-made.

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