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illustration of a proposed topological insulator

ON THE EDGE  Sound waves, shown in red and blue, are confined to the edge of a proposed acoustic topological insulator in these computer simulations. Sound moves counterclockwise from the source and easily navigates sharp turns (top). 

mirror made of copper wire

PICKY MIRROR  A mirror made of copper wire embedded in plastic (left) reflects microwaves with a wavelength of about 60 millimeters. Other light passes right through the mirror.

Splashing coffee

SQUASH THE SLOSH  Just a few layers of surface bubbles can save a beverage from splashing all over the kitchen counter. 

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