Physicists at the Australian National University have developed the most sensitive method ever for measuring the potential energy of an atom (within a hundredth of a decillionth of a joule—or 10-35 joule), and used it to validate one of the most tested theories in physics—quantum electrodynamics (QED).
Click here for original story, Invisible helium atoms provide exquisitely sensitive test of fundamental theory
Source: Phys.org