Under certain circumstances, a wave can split into several paths, reaching some places with high intensity, while avoiding others almost completely. This kind of 'branched flow' has first been observed in 2001. Scientists have now developed a method to exploit this effect. The core idea of this new approach is to send a wave signal exclusively along one single pre-selected branch, such that the wave is hardly noticeable anywhere else.
from Latest Science News -- ScienceDaily http://bit.ly/2xbGFDe
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