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Sentosa
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In his book https://www.amazon.com/dp/0385477058/?tag=pfamazon01-20, Michio Kaku is discussing hydrogen fusion and states that, "the protons in hydrogen weigh more than the protons in helium". Is this correct? I understand that atoms and nuclei will weigh different amounts, but I thought a proton was a proton, no matter where in the universe it was located.
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