One of physics' most exciting recent discoveries is the antiproton. It resembles an ordinary proton (present in the nuclei of all atoms), except that its electric charge is negative instead of positive. There may be (but probably are not) places in the universe where antiprotons can exist permanently, but on earth they are short-lived. As soon as one of them touches the nucleus of an ordinary atom, it is annihilated. Both its own matter and the matter of a proton or neutron in the nucleus turn into a flash of energy.
Antiprotons were created...
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