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Simulation of many identical atoms undergoing radioactive decay, starting with either 4 atoms per box (left) or 400 (right).
At high geomagnetic latitudes, the carbon-14 spreads evenly throughout the atmosphere and reacts with oxygen to form carbon dioxide.
The Norse and Old English words are from Proto-Germanic "root," though they admit this might have influenced the "tribe, nation" sense.
Original senses in English included "wines with characteristic flavor" (1520), "group of people with common occupation" (c. Meaning "tribe, nation, or people regarded as of common stock" is by 1560s. Meaning "raise above a fair level" (of rent, etc.) is from 1550s. Teenager slang meaning "to sleep" is from 1960s (, originally an implement for stretching leather, etc.
Play a game that tests your ability to match the percentage of the dating element that remains to the age of the object.
) is the time required for a quantity to reduce to half its initial value.