Creating Antimatter: Matter's "Evil Twin" : Short Wave 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)

Antimatter: Matter's "Evil Twin"

Antimatter: Matter's "Evil Twin"

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A partial view of the complex Large Hadron Collider (LHC) at the CERN particle physics research facility. CERN, the European Organization for Nuclear Research, is the world's largest laboratory for research into particle physics. Ronald Patrick/Getty Images hide caption

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Ronald Patrick/Getty Images

A partial view of the complex Large Hadron Collider (LHC) at the CERN particle physics research facility. CERN, the European Organization for Nuclear Research, is the world's largest laboratory for research into particle physics.

Ronald Patrick/Getty Images

Physicists have known about antimatter for decades. And they've known that, according to the math, there should be just as much of it lurking around the universe as there is matter. But, as NPR correspondent Geoff Brumfiel tells us, so far antimatter has mostly escaped the detection of physicists. (Encore episode)

Follow Emily on Twitter — she's @emilykwong1234. You can follow Geoff, @gbrumfiel. He tweets a lot — mostly about physics, missiles, and nuclear proliferation.

Plus, email the show at shortwave@npr.org. We love hearing from you.

This episode was edited by Viet Le, and fact-checked by Emily Vaughn.