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Carbon-14 is continually formed in nature by the interaction of neutrons with nitrogen-14 in the Earth’s atmosphere; the neutrons required for this reaction are produced by cosmic rays interacting with the atmosphere.

Radiocarbon present in molecules of atmospheric carbon dioxide enters the biological carbon cycle: it is absorbed from the air by green plants and then passed on to animals through the food chain.

The principle, dating from the 3rd century BCE or even earlier, is a fundamental concept in Chinese philosophy and culture in general.It may also be a struggle by a national group within its own nation-state for wider rights for its members, or it may be a (reactionary) struggle by such a national group against wider rights for minority groups.A cultural nationalist movement, which historically often precedes a political movement, is an effort to rediscover, preserve, study, or reinvigorate the language or cultural traditions of a nation.In Chinese religion, the Taoists favour Yin whilst Confucianists favour Yang in keeping with the prime focus of their respective philosophies.The Taoists emphasize reclusion whilst Confucianists believe in the importance of engagement in life.

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