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Carbon 14

Ancient Tree Mystery Had Cosmic Cause, Researchers Say

Posted 11.28.2012 | Science

By: Clara Moskowitz Published: 11/28/2012 01:14 PM EST on Something big happened in the year A.D. 774. Scientists studying tree rings fo...

Cara Santa Maria

How Old Is Life On Earth, And How Do We Know? | Cara Santa Maria | Posted 05.24.2012 | Science

The Earth is 4.54 billion years old; 3.8 billion years ago, the very first life form came into existence; 225 million years ago, dinosaurs came on the...