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Video: Sprites, gravity waves and airglow

Look! Fast! Sprite lightning occurs only at high altitudes above thunderstorms, only last for a thousandth of a second and emit light in the red portion of the visible spectrum, so they are really difficult ...

Sep 05, 2014
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California smartphone 'kill switch' bill advances

On a second attempt, California lawmakers have advanced a bill that would require electronics manufacturers to install a shut-off function in all smartphones as a way to deter what one senator called a crime wave of thefts.

May 08, 2014
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