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What’s the matter?

The source of matter’s dominance over antimatter in the universe might be revealed by tiny subatomic particles called neutrinos, Emily Conover reported in “Mounting evidence suggests neutrinos are key to why antimatter is rare” (SN: 12/21/19 & 1/4/20, p. 12).

The story stated that matter and antimatter existed in equal measure in the early universe, and that when they come together, they annihilate each other.