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Physicists believe they may have found fifth force of nature

Chemist

"Er, wasn't the weak and electro-magnetic forces unified into the electro-weak force upon the discovery of the W & Z vector bosons at CERN back in the 1980s? Which would mean that there are now thought to be 4 forces, namely gravity, strong, electro-weak, and this new one?"

AFAIK it depends on the temperature of the systems you are considering. The weak & electromagnetic appear to be indistinguishable above a certain energy/temperature and indeed I think the strong nuclear force can also be unified above an even higher temperature.

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