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DOUBLE UP  A device made of two layers of graphene (illustrated) can conduct electricity without resistance when one layer is rotated relative to the other.

battery in snow

CHILL OUT  A new type of battery that works at extremely low temps could help build sturdier consumer electronics or power vehicles on other planets.

video of bullet impact on test space shield

PACKS A PUNCH  Engineers are testing a new spacecraft shield by slamming a bullet into it at 7 kilometers per second.   

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