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 R...

Source: [Phys.org](https://phys.org/news/2026-06-birds-newton-theory-sharpen-flocks.html)

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