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All of them produce calls with rapid, vibrato-like fundamental frequency modulation -- ...

Though modern horses now have a single toe, their earliest ancestors had three on their front legs, and four on the back.

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.

The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.

Libby received the Nobel Prize in Chemistry for his work in 1960.

A molecule of nitrogen gas is made up of two nitrogen atoms.— In earth and environmental sciences, radioactive isotopes, atom variants that decay over time, play a major role in age determination.A radioactive isotope of the inert gas argon 39, for example, is ...— It was while working in the Kent Laboratory building in the 1940s that researchers developed radiocarbon dating—an innovative method to measure the age of organic materials. — The Earth's magnetic field experiences reversals such that north becomes south. Researchers have dated volcanic ash that was formed immediately before ...— The precise dating of ancient charcoal found near a skull is helping reveal a unique period in prehistory.Carbon-14 dating (also called "radiocarbon dating") is used to determine the age of materials that contain carbon that was originally in living things.