Quark
From Wikipedia, a free encyclopedia written in simple English for easy reading.
Quarks are smaller than atom particles that, for example, make up neutrons and protons. Scientists had once believed that protons, neutrons, and electrons were the most fundamental particles that made up everything in the universe.
Then they invented the particle accelerator and realized that there were, in fact, hundreds of other 'fundamental', even smaller particles that made up the protons and neutrons and electrons themselves.
Then they found out that even these supposedly fundamental particles were actually just various arrangements of the even more basic quarks and leptons. There are six types of quarks, and six types of leptons.
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