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image: In Canada, Signs of Life Nearly 4 Billion Years Old

In Canada, Signs of Life Nearly 4 Billion Years Old

By Ashley P. Taylor | September 28, 2017

Embedded within 3.95-billion-year-old rock, scientists have found graphite with a carbon signature that indicates biological activity.

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image: Study: Last Woolly Mammoths Died of Thirst

Study: Last Woolly Mammoths Died of Thirst

By Alison F. Takemura | August 3, 2016

On remote island near Alaska, salt water intrusion and a warming climate killed off the last remaining survivors of the species.

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image: Capsule Reviews: Summer Fiction

Capsule Reviews: Summer Fiction

By Bob Grant | August 1, 2013

Crescent, An Empty Land of Plenty, Prophet of Bones, and Equilateral

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image: Coral Clocks

Coral Clocks

By Kerry Grens | March 1, 2013

Uranium dating of coral tools used by the earliest settlers of the South Pacific island kingdom of Tonga offers unprecedented precision in reconstructing their history.

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