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Dna Mutation Clock Proves Tough to Set

Genetic mutation

Human mutations are not just a favourite device in science-fiction films such as the X-men series, they also offer a way to mark time in the evolutionary past.

Credit: Murray Close/Getty

Mathematicians keep refining π even though they know it to more than 12 trillion digits; physicists beat themselves up because they cannot pin down the gravitational constant beyond three significant figures.

From Nature
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