A mammoth that lived in Alaska about 17,000 years ago traveled so far and wide that, if it had walked in a straight line, it would have gone all the way around the world — nearly twice. 

Recent analysis of the woolly ice age beast’s preserved tusk revealed that in 28 years, it walked almost 50,000 miles (80,500 kilometers). To retrace the adult mammoth’s steps, researchers did something that had never been done before: They sliced open a mammoth tusk along its length, investigating the chemistry of the layers that built up in the tusk year after year during the animal’s lifetime. 

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