A time-reversed wave is a mirror image of a wave that travels the exact opposite path of the wave that it is a reflection of, back to the first wave's point of origin. Creating these time-reversed waves has required unique antennas but now a group of researchers has done so simply by physically jolting the water container.
Paper:http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys3810.html
Video credit: Emmanuel Fort
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