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Her parents, Alison (Cain) and Grant Atwell, both motivational speakers, met at a London workshop of Dale Carnegie's self-help bible "How to Win Friends and Influence People"...I think it will be a balance of creative and commercial choices, going forward.Radiometric dating is possible because this decay occurs at a known rate, called the “half-life” of the radioactive element.

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Once the rock hardens, however, all the Argon-40 is trapped in the sample, giving us an accurate record of how much Potassium-40 has decayed since that time.

The expansion of the universe gives an age for the universe as a whole: 13.8 billion years old.

Astronomers and geologists have determined that the universe and Earth are billions of years old.

An element in the periodic table can come in different flavors called isotopes.

Some isotopes are unstable, and over time these isotopes “decay” into isotopes of other elements.

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