What if electric cars could be charged on the go, never needing to stop to refuel? That’s the implication of technology created by Stanford University engineers. The group transmitted electricity across a 3-foot distance to a moving object. The technology involves magnetic resonance coupling, in which an electrical current in one set of wires creates a magnetic field that causes current to flow in another coil of wire nearby. Normally, the transfer of power happens only when sending and receiving wires are stationary. The Stanford group made a simple tweak that allowed the electricity to be transferred to a device on the move. The technology also carries significant implications for robots.