For the first time, researchers have seen how light behaves during a mysterious phenomenon called 'imaginary time'. When you ...

An imaginary number is a value that's the square root of a negative number. It can't exist on a one-dimensional number line. We'll explain.

Quantum theory’s prominent use of complex numbers — sums of imaginary and real numbers — was disconcerting to its founders, including physicist Erwin Schrödinger.