The forces of nature we experience every day can be reduced to just four categories: gravity, electromagnetism, the strong force and the weak force.
But physicists at a laboratory near Chicago conducting the Muon g-2 experiment say they have found possible signs of a fifth fundamental force.
The UK’s Science and Technology Facilities Council (STFC) said it provides strong evidence for the existence of an undiscovered sub-atomic particle or new force”. But the results don’t add up to a conclusive discovery yet.
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