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).
Z. Yang et al/Physical Review Letters 2015
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.
V.S. Asadchy et al/Physical Review Letters 2015
SQUASH THE SLOSH Just a few layers of surface bubbles can save a beverage from splashing all over the kitchen counter.