http://www.iflscience.com/sites/www.iflscience.com/files/styles/ifls_large/public/blog/2016-05/shutterstock_296927024.jpg?itok=ATJXhjhB
http://www.scienceofwonder.org/earths-atmosphere-was-once-much-thinner-than-we-thought/

Every scientific field has its own version of time travel. Physicists look at light emerging from the darkest regions of the universe to peer back at the ancient formation and destruction of stars. Biologists use genetics to work out how one species evolved from another. And geologists use frozen bubbles, which capture the state of the world around it at the time they formed.

Some of these bubbles are found in ice cores drilled from the p Continue reading Earth’s Atmosphere Was Once Much Thinner Than We Thought