A new imaging technology is giving scientists unprecedented views of the processes that affect the flow of electrons through materials. By modifying a familiar tool in nanoscience — the scanning tunneling microscope — researchers have been able to visualize what happens when they change the electronic structure of a “heavy fermion” compound made of uranium, ruthenium and silicon. What they found sheds light on superconductivity — the movement of electrons without resistance — which typically occurs at extremely low temperatures and that researchers hope one day to achieve at something close to room temperature, which would revolutionize electronics.