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550s BC

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Centuries: 7th century BC - 6th century BC - 5th century BC

Decades: 600s BC - 590s BC - 580s BC - 570s BC - 560s BC - 550s BC - 540s BC - 530s BC - 520s BC - 510s BC - 500s BC

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Up quark

... by gluons, always maintaining the result neutral. This interchange of color charge is thought to result in the strong nuclear force holding quarks together in mesons ...