1,2 Graphene famously conducts electrons as though they were massless particles like photons, which means that their speed does not depend on their energy. However, just as the speed of light varies in different materials, the speed of electrons in graphene can be controlled. It was predicted to hit zero in bilayer graphene with a ‘magic angle’ twist of 1.1° between the layers, allowing electron–electron interactions to dictate the structure’s properties. In 2018, Pablo Jarillo-Herrero and colleagues at the Massachusetts Institute of Technology confirmed this, showing that feeding electrons into twisted bilayer graphene at cryogenic temperatures could produce a novel superconductor. Subsequently, says Jarillo-Herrero, various groups – including his own – have tested other twisted systems. ‘They have found interesting correlated [electron] materials and correlated behaviour, but none of them was a robust superconductor.’