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Contents: The half-life of a radioactive isotope is defined as the time it takes half of a sample of the element to decay.

A mathematical formula can be used to calculate the half-life from the number of breakdowns per second in a sample of the isotope.

I found several good sources, but none that seemed both complete enough to stand alone and simple enough for a nongeologist to understand them.

He is highly respected amongst his peers and fans and has achieved considerable championship success in professional wrestling, although he has never been a world champion.

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Now 72, she is involved in numerous voluntary organisations, and she chaired the European Blind Union's commission on transport for 15 years.

Roger Allsopp A retired breast-cancer surgeon from Guernsey who last summer, at the age of 70, became the oldest person to swim the English Channel.