An imbalance between matter and antimatter in the universe produced all the things in existence, including corned beef sandwiches.
Erik Rank/Getty Images
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Somehow, at the beginning of time, there was an imbalance of matter and antimatter. That's how all the stuff in the universe came about. Scientists think they may find an answer by studying neutrons.
A man walks past a board announcing elections at the European Parliament in Brussels on Wednesday. Some 400 million Europeans from 28 countries are eligible to vote.
Francisco Seco/AP
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The Martinez family stands in front of their home in New Jersey. During a speech at her graduation, Alondra said to her parents: "Mamá, papá, lo logramos." Mom, dad, we made it.
Mohamed Sadek for NPR
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Sarah Seltzer interviews her grandfather, 104-year-old Gilbert Seltzer, in West Orange, N.J., in January for StoryCorps.
Afi Yellow-Duke/StoryCorps
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U.S. citizens use ropes to cross the Rio Grande from San Antonio del Bravo, Mexico, into Candelaria, Texas. U.S. citizens depend on the free health clinic in San Antonio del Bravo.
Lorne Matalon for NPR
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An imbalance between matter and antimatter in the universe produced all the things in existence, including corned beef sandwiches.
Erik Rank/Getty Images
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