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Spin Structure of Protons and Neutrons Normally, we think of building blocks as static objects. For instance, the brick and mortar used to build the local bank remain pretty much the same from the day it's built to the day it's torn down. But the building blocks of ordinary matter are different. These bricks are particles called quarks, and the mortar is made up of particles called gluons. Quarks and gluons are in constant motion, taking part in a complicated dance to build protons and neutrons (also called nucleons).
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