Scientists from the National Graphene Institute at The University of Manchester demonstrated that superconductivity in magic-angle graphene can be completely switched off by screening interactions between electrons. ^[1] Professor Alexey Berdyugin from the National University of Singapore said that when the screening was switched on, superconductivity was completely suppressed, providing clear experimental evidence that the phenomenon originates from strong electron-electron interactions. ^[2] The researchers observed that increasing the carrier density in the neighboring graphene bilayer progressively weakened superconductivity in the adjacent magic-angle graphene until it was completely suppressed. ^[3] The team compared experimental results with theoretical modeling and found that conventional phonon-mediated superconductivity would be expected to remain largely unchanged or increase slightly when Coulomb interactions are screened, contrary to the observed opposite behavior. ^[4] The team built a device containing two twisted graphene bilayers separated by less than a nanometre, allowing one layer to act as a tunable screening layer for the other. ^[5]