Antimatter: Matter's "Evil Twin"
![Antimatter: Matter's "Evil Twin"](https://www.podcastworld.io/podcast-images/short-wave-fs1irssd.webp)
Physicists have done the math and there should be as much antimatter as matter in the universe — but that hasn't been the case so far. NPR correspondent Geoff Brumfiel explains what's up with matter's "evil twin," antimatter. (Encore episode)
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