Optical systems combining balanced loss and gain provide a unique platform to implement classical analogues of quantum systems described by non-Hermitian parity–time (PT)-symmetric Hamiltonians. Such ...

Symmetry attracts us. Studies comparing people’s reactions to different faces have shown, for example, that they find highly symmetrical faces more attractive than less symmetrical faces. The symmetry ...

Women have more orgasms during sex with men who are more symmetrical. Does this penchant for order cloud our ability to see the universe accurately? A new book by theoretical astrophysicist Mario ...