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Radiocarbon decays slowly in a living organism, and the amount lost is continually replenished as long as the organism takes in air or food.
Once the organism dies, however, it ceases to absorb carbon-14, so that the amount of the radiocarbon in its tissues steadily decreases.
Carbon-14 has a half-life of 5,730 ± 40 years—, half the amount of the radioisotope present at any given time will undergo spontaneous disintegration during the succeeding 5,730 years. It has proved to be a versatile technique of dating fossils and archaeological specimens from 500 to 50,000 years old.
Because carbon-14 decays at this constant rate, an estimate of the date at which an organism died can be made by measuring the amount of its residual radiocarbon. The method is widely used by Pleistocene geologists, anthropologists, archaeologists, and investigators in related fields.
Actually, the American and French revolutions may be regarded as its first powerful manifestations.Although the 17th-century Puritan Revolution in England was animated by nationalist sentiment, significant nationalist movements generally did not arise until the late 18th century.The American and French revolutions (1775––99, respectively) were both expressions of political nationalism.The two opposites of Yin and Yang attract and complement each other and, as their symbol illustrates, each side has at its core an element of the other (represented by the small dots).Neither pole is superior to the other and, as an increase in one brings a corresponding decrease in the other, a correct balance between the two poles must be reached in order to achieve harmony.