You don’t have to be perfectly organized to pull off a wave, according to scientists. Using a set of gyroscopes linked together, physicists explored the behavior of a material whose structure is arranged randomly, instead of an orderly lattice. They found they could set off one-way ripples around the edges, much like spectators in a sports arena – a ‘topological wave,’ characteristic of a particularly unusual state of matter.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2018/01/180115120548.htm
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