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Making Cold Antimatter

Low-energy atoms of antihydrogen will enable researchers to test a fundamental property of the universe
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It is the nemesis of normal matter: antimatter.

Like evil twins of ordinary particles, antimatter versions mirror their mundane counterparts in every way, except for having the opposite charge, and they promise violent annihilation if ever the twain should meet. Indeed, the conflagration of a single gram of antimatter particles merging with their normal matter siblings would release energy equivalent to about 40 kilotons of TNT, or enough to power nearly 5,000 households for a year.

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