Physicists at New York University have built a time crystal powered entirely by sound waves, and lab tests suggest the particles can interact in a way that appears to defy Newton’s third law in the ...

In context: Sound waves typically propagate in forward and backward directions. This natural movement is problematic in some situations where unwanted reflections cause interference or reduced ...

What if you could listen to music or a podcast without headphones or earbuds and without disturbing anyone around you? Or have a private conversation in public without other people hearing you? Newly ...

Music lovers may one day be able to blast their favorite artists, headphone-free, without angering the neighborhood or ...