SMRTR Science & EngineeringMar 23, 2026Interesting Engineering

US: Newton’s third law of motion broken by new time crystal built using sound waves

SMRTR summary

NYU physicists created a time crystal using floating styrofoam beads suspended by sound waves, where particles appear to violate Newton's third law of motion by moving in nonreciprocal ways. The breakthrough occurs because larger beads scatter more sound than smaller ones, creating unbalanced forces that could advance understanding of biological systems and open new technological possibilities.

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