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Antimatter falls down, not up: CERN experiment confirms theory
(www.nature.com)
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There's also no real reason for there to be more matter than antimatter in the universe. Any sufficiently high energy action will produce equal amounts of matter and antimatter, but there's overwhelmingly more matter than antimatter floating around. It's one of the big questions.
I have all of it, and I will never share with any of you
How do we know how much Antimatter there is? How do we know how much matter exists?