Researchers have visualized for the first time the direct effect of the Pauli exclusion principle, a fundamental feature of quantum mechanics that allows ordinary matter to be stable, among other ...

A cloud of ultracold atoms is like a motel with a neon “no vacancy” sign. If a guest at the motel wants to switch rooms, they’re out of luck. No vacant rooms means there’s no choice but to stay put.

Without the Pauli exclusion principle, matter as we know it would not exist. But at low, low temperatures, even this quantum law gives way DESPITE its name, this principle is pretty inclusive: ...