While monitoring an excited helium atom’s decay, they observed it emitting light, which is not unusual. Hungarian scientists from the Atomki Nuclear Research Institute led by Professor Attila Krasznahorkay believe they have found evidence of a fifth force of nature. Surely there must be another force (or forces) that explain both its existence and the reason for its darkness. But the existence of dark matter makes this model seem incomplete. Together, these have become the standard model of particle physics. They are gravity, electromagnetism, the weak nuclear force that causes particle decay, and the strong nuclear force that binds quarks into atoms. Over the years, humans have come up with four forces that can be used to describe every single interaction in the physical world.
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