![Spacepod show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/068/533/small/spacepod.jpg)
Summary: Dr. Dan Petrizzo explains what isotopes are, and what isotopes in water can tell scientists about ancient climates. He also explains how he made Mars rocks in the lab.
Summary: Dr. Dan Petrizzo explains what isotopes are, and what isotopes in water can tell scientists about ancient climates. He also explains how he made Mars rocks in the lab.