title

Science News Flash

Reasons To Believe

Followers
Plays
Science News Flash
28 MIN2012 MAY. 2
Play Episode
Comments
title

Details

You might have seen:
Nature, Air density 2.7 billion years ago limited to less than twice modern levels by fossil raindrop imprints; http://www.nature.com/nature/journal/v484/n7394/full/nature10890.html