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Carbon-14, or radiocarbon, is a naturally occurring radioactive isotope that forms when cosmic rays in the upper atmosphere strike nitrogen molecules, which then oxidize to become carbon dioxide.Green plants absorb the carbon dioxide, so the population of carbon-14 molecules is continually replenished until the plant dies.
White, 22, has been dancing with his partner, Meryl Davis, since 1997 and the team has really come into its own in the last few years, winning the 20 U.
White and Davis are coached and choreographed by Igor Shpiland, a Russian Jewish immigrant.
February 16, 2010 In my previous column for Interfaith.com, I reported on three American athletes going to the Winter Olympic Games in Vancouver: ice dancer Ben Agosto, bobsledder Steve Mesler, and biathlon athlete Laura Spector.
Carbon-14 has a half-life of 5,730 ± 40 years, meaning that every 5,700 years or so the object loses half its carbon-14.
Samples from the past 70,000 years made of wood, charcoal, peat, bone, antler or one of many other carbonates may be dated using this technique.