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I believe this is about dark matter.

I found this news article that discusses an article from the same researchers: https://bigthink.com/surprising-science/fifth-force-nature

Abridged from the article: "The mysterious X17 subatomic particle is indicative of a fifth force of nature. Four fundamental forces of nature: gravity, electromagnetism, the strong nuclear force, and the weak nuclear force. The discovery of a fifth force of nature could help explain the mystery of dark matter, which is proposed to make up around 85 percent of the universe's mass."

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