When a guitar string is plucked or a playground swing is set in motion, the movement gradually fades away. Physicists call these “damped harmonic oscillators,” and Newton’s laws do a fine job of ...

A newly demonstrated link between a time crystal and a mechanical system opens a door scientists once thought closed.

For nearly a century, some of the simplest questions in quantum theory have stubbornly resisted clean answers, turning basic textbook systems into deep conceptual traps. That long stalemate is now ...