Protons are tiny pieces of matter, but they are not fundamental—they are made up of quarks and gluons. In an effort to decipher the particle's internal structure, researchers took protons and bounced electrons and positrons off them.
Source & further reading:http://physicstoday.scitation.org/do/10.1063/PT.5.7358/full/
Image credit: Christine Daniloff/MIT
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