So when a study in Nature identified a previously unknown and very large spike in carbon around the year AD, it raised a lot of eyebrows. Nobody could think of a historical account of unusual phenomena in the heavens that might have triggered a surge in 14 C production, and something like this should have been hard to miss. The original report, published by researchers from Nagoya University in Japan, involved analysis of Japanese cedars.
When researchers find a bone or artifact, how do they know how old it is?
Gardner, Purdue University. Radioactive decay rates, thought to be unique physical constants and counted on in such fields as medicine and anthropology, may be more variable than once thought. A team of scientists from Purdue and Stanford universities has found that the decay of radioactive isotopes fluctuates in synch with the rotation of the sun's core.
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