Light beam 'swims' upstream through a quantum fluid by violating Newton's third law
WorldPing
Just as a leaf drifts along with a stream, objects in other moving fluids normally drift along with the flow. That is, unless they exert energy to move against it. Although it may be less intuitive, light waves or photons work similarly.
This is a short WorldPing brief. The full report was published by Phys.org.
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