Neutrinos are elementary particles that are extremely light and rarely interact with anything else. Mostly, they pass invisibly through the universe—hundreds of trillions of neutrinos will have passed through your body as you read this. For physicists, though, these ghostly particles present a big problem. The prevailing theory of particle physics, the Standard Model, predicts that neutrinos should have no mass—but this is not what physicists observe in the real world. Now, scientists at JUNO, an enormous new lab in China, have started to hunt for the elusive particles and, in doing so, they hope to solve this giant conundrum in fundamental physics.
Host: Alok Jha, The Economist’s science and technology editor, with Emilie Steinmark, The Economist’s science correspondent. Contributors: Juan Pedro Ochoa-Ricoux of the University of California, Irvine; Wang Yifang and Yuekun Heng of the Chinese Academy of Sciences.
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