A hadron is a subatomic particle composed of quarks and gluons. They are subdivided into baryons, formed by three quarks, like protons and neutrons;
and mesons, formed by configurations quark/antiquark pairs, such as pions and kaons.
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... on May 24, 1864. On May 10, 1873, at his request, he was permitted to travel to Molokai to help the lepers who had virtually nothing to keep them warm or fed. After ...