The radiocarbon dating method is based on the fact that radiocarbon is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen.The resulting radiocarbon combines with atmospheric oxygen to form radioactive carbon dioxide, which is incorporated into plants by photosynthesis; animals then acquire in a sample from a dead plant or animal such as a piece of wood or a fragment of bone provides information that can be used to calculate when the animal or plant died.

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Meanwhile, the share of 55- to 64-year-olds who use online dating has doubled over the same time period (from 6% in 2013 to 12% in 2015).

For young adults in particular, this overall increase in online dating usage has been accompanied by a dramatic increase in the use of mobile dating apps.

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