Episode 46: How to Find a Snowball in a Desert

Guest: Cecilia Sanders The pages of Earth's history are written in its rocks, and geobiologist Cecilia Sanders is interested in a sequence of rocks that tell the story of one of Earth's coldest periods: the Cryogenian. In order to read those pages—and the fossilized fine-print that describes life some 600-700 million years ago—she has to embark on an away mission to Namibia. Follow us on Twitter! Michael: @Miquai Elise: @emcuttsy