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Suppose you slammed together two neutrons at near-luminous speed. The resulting collision would create a cascade of particles from protons, electrons, and neutrinos to more exotic fare. We can't predict the exact number or type of particles produced, but we do know one thing: the total charge of all the particles would be zero. This is because charge is a conserved quantity, and since the neutrons have zero total charge, their resulting particles must have the same.

