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Why birds ignore Newton: New theory could sharpen models of flocks, crowds and cells

Why birds ignore Newton: New theory could sharpen models of flocks, crowds and cells
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Birds in flocks, bacteria and cells: In many collective systems, individual elements respond to only part of their surroundings, seemingly defying Newton's third law of motion—action equals reaction. These exceptions are known as nonreciprocal interactions. A Dresden physics team working with Roderich Moessner, a founding member of the Würzburg–Dresden Cluster of Excellence ctd.qmat, has now devel

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