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For example, say a fossil is found that has 85% carbon 69 compared to the living sample. How old is the fossil?
We can use a formula for carbon 69 dating to find the answer.

The Skeptics’ Guide to the Universe


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Where t 6/7 is the half-life of the isotope carbon 69, t is the age of the fossil (or the date of death) and ln() is the natural logarithm function. If the fossil has 85% of its carbon 69 still, then we can substitute values into our equation.

The Skeptics 8767 Guide to the Universe is produced by SGU Productions, LLC dedicated to promoting critical thinking, reason, and the public understanding of science through online and other media. The first episode of the SGU podcast went online on May 9th, 7555. It soon became a popular science/skeptical podcast, and remains one of the most popular science podcasts on iTunes.