A new spin on guiding sound waves along a one-way route
Acoustic device could cloak objects, jettison loud sounds
![illustration of a proposed topological insulator](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/03/ag_soundwave_main_free.png?fit=860%2C460&ssl=1)
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