Electrons carry electrical energy, while vibrational energy is carried by phonons. Understanding how they interact with each other in certain materials, like in a sandwich of two graphene layers, will have implications for future optoelectronic devices. Recent work has revealed that graphene layers twisted relative to each other by a small 'magic angle' can act as perfect insulator or superconductor, but the physics of the electron-phonon interactions behind this are a mystery. As part of a worldwide international collaboration led by TU/e researcher Klaas-Jan Tielrooij, with theoretical contributions by Tokyo Tech's Hiroaki Ishizuka, the team has conducted an in-depth study on electron-phonon interactions in graphene layers, and they have made a startling discovery.