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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 SPACE.com 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?

HuffingtonPost.com | 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...