This “Atomic Cannon” Could Challenge Einstein’s Theory of Gravity

Scientists have built an “atomic cannon” to test whether exotic matter falls as Einstein’s theory predicts. Researchers at ETH Zurich and the Paul Scherrer Institute (PSI) in Villigen have created a tightly controlled beam of muonium, an unusual atom containing an electron and an antimuon. Their advance, described in Nature Physics, clears a major obstacle [...]