Physics News Update Quantum gravitational states have been observed for the first time. An experiment with ultracold neutrons shows that their vertical motion in Earth's gravitational field come in discrete sizes. Quantum properties--such as the quantization of energies, wavelike dynamics including interference, and an irreducible uncertainty in the simultaneous measurement of position and momentum--usually emerge only at the atomic level or under special circumstances (e.g., low temperatures) wherein a particle is trapped in a potential well by a controlling force. Observing such properties in phenomena governed by the electromagnetic or the weak and strong nuclear forces is common enough, but the strength of gravity, many orders of magnitude weaker than the other forces, has not previously been strong enough to enforce the kind of confinement needed to make quantum reality manifest.