carbon dating
In Canada, Signs of Life Nearly 4 Billion Years Old
In Canada, Signs of Life Nearly 4 Billion Years Old
Ashley P. Taylor | Sep 28, 2017
Embedded within 3.95-billion-year-old rock, scientists have found graphite with a carbon signature that indicates biological activity.
Study: Last Woolly Mammoths Died of Thirst
Study: Last Woolly Mammoths Died of Thirst
Alison F. Takemura | Aug 3, 2016
On remote island near Alaska, salt water intrusion and a warming climate killed off the last remaining survivors of the species.
Capsule Reviews: Summer Fiction
Capsule Reviews: Summer Fiction
Bob Grant | Aug 1, 2013
Crescent, An Empty Land of Plenty, Prophet of Bones, and Equilateral
Coral Clocks
Coral Clocks
Kerry Grens | Mar 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.