U.S. scientists are being lured abroad—and they aren't looking back

By day American physicist Kenneth Long works with the world’s largest particle accelerator, the Large Hadron Collider at CERN near Geneva. He wants to better understand the W boson, a subatomic particle that is responsible for some kinds of radioactivity and for fusion. But he also likes bikes, and this July you might find him on a scenic roadside, cheering on competitors in the Tour de France. He won’t have to take an international flight to spectate: Long moved abroad in February, splitting...