Meet antimatter: the universe’s moody, mirror-image twin that’s been having a bit of an identity crisis since 1928. It looks and acts exactly like “normal” matter, except it carries the opposite charge and has a zero-tolerance policy for physical contact. If you ever met your antimatter doppelgänger, you shouldn’t shake hands; you’d both instantly vanish in a giant flash of light, leaving behind nothing but a very confused insurance adjuster.

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