On July 14, the Mu2e Project achieved a significant milestone with the approval of Critical Decision 3, which authorizes start of full construction.

The forthcoming Mu2e experiment at Fermilab will kidnap muons and trap them in aluminum atoms. But what exactly happens when you shoot a muon at an aluminum foil? While Mu2e is under construction, its scientists are already getting some valuable answers from a smaller accomplice: AlCap.