New superconductor claim sparks frenzy online, but scientists are sceptical

An unusual material, named LK-99, has been presented to the world as a superconductor that would carry electricity at room temperatures with zero resistance. On Twitter — or X, “LK-99” has been a trending topic in recent days, and enthusiasts have hailed what they believe to be a longsought holy grail of physics, one that would transform everyday life with new technologies to solve climate change and make levitating trains commonplace.