Distortion-free structured light

An exciting prospect in modern optics is to exploit patterns of light—how the light looks in its many degrees of freedom—often referred to as "structured light." Each distinct pattern could form an encoding alphabet for ...

70 percent of US under winter warning as freeze hits

A historic and brutal winter storm put some 240 million Americans under weather warnings Friday as the United States faced holiday travel chaos, with thousands of flights canceled and major highways closed.

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