An international team of scientists, working on a project in the United States, say they have discovered strong evidence for the existence of a new force of nature.
They say some sub-atomic particles - called muons - don't behave in a way predicted by current theories of physics.
The British funders of the research say that scientists are “on the precipice of a new era of physics”.
Huw Edwards presents BBC News at Ten reporting by science correspondent Pallab Ghosh.
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