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Why is half the Universe missing?

When the Universe began, the cosmos was full of energy. Energy can convert into matter and antimatter. As the Universe expanded and cooled, all that energy should have made matter and antimatter in equal quantities. Yet, when we look around us, we are left with a puzzling observation: The Universe we see is made solely of matter. Understanding why the Universe was created with more matter than antimatter is key to understanding why anything exists.