In the very first microseconds of the Big Bang, something strange happened. Matter somehow outnumbered antimatter and kept the fledgling universe from annihilating itself. This break with conventional ...

For generations, physicists were sure the laws of physics were perfectly symmetric. Until they weren’t. Symmetry is a tidy and attractive idea that falls apart in our untidy universe. Indeed, since ...

Parity violation in neutron physics represents a subtle but fundamentally important deviation from mirror symmetry in nuclear interactions. This phenomenon arises from the interplay between the weak ...