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­ ­You probably have seen or read news stories about fascinating ancient artifacts.At an ar­chaeological dig, a piece of wooden tool is unearthed and the archaeologist finds it to be 5,000 years old.

For some fishermen, a biologist recently told me, netting a Greenland shark is about as welcome as stepping in dog poop. It is among the world’s largest predatory sharks, growing up to eighteen feet in length, but also among its most elusive.A child mummy is found high in the Andes and the archaeologist says the child lived more than 2,000 years ago.How do scientists know how old an object or human remains are?Heinemeir analyzed the infants’ lenses and came up with remarkably precise estimates.Two, he found, had been born in the second half of the nineteen-eighties, the third between 20.

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