Theoretical physicists have insisted for years that anti-protonsprotons with a negative electrical chargewould eventually be found. But their theories also told them that antiprotons, though stable in a vacuum, cannot exist in contact with ordinary matter. As soon as one of them encounters a normal proton, both it and the proton it hits will vanish in a flash of energy. This makes antiprotons hard to find in nature, which is loaded with ordinary protons lying in wait to destroy them. It is like searching for living insects in a bottle of DDT.
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