Great news! We've been nominated for a Webby Award! Our three-part Katrina series is a finalist for Best News & Politics limited series podcast. Now, we need your help. Voting ends Thursday, April 16! Cast your vote at bit.ly/webbybipisci    Antarctic scientists have long known the region’s ice sheet holds clues to the planet’s ancient past. Yet even the field’s foremost experts were shocked when they extracted a six-million-year-old ice core — twice as old as expected and the oldest recorded so far. Researchers say it will provide one of our best looks ever into Earth's climatological record. In a relatively more recent past, the discovery of 40,000-year-old notches and lines carved into artifacts and cave walls in Germany, examples of protowriting, suggest humans began documenting ideas thousands of years earlier than thought. Those timescales pale however, when compared to the age of the Earth’s most ancient rocks, which have a story to tell too. Find out how the planet’s most venerable rocks, formed billions of years ago, reveal the geological conditions that allowed life to get a foothold.  Guests: Huw Groucutt – Archeologist, Department of Classics and Archeology, University of Malta Ed Brook – Paleoclimatologist and professor of Earth, Ocean and Atmospheric Sciences at Oregon State University Simon Lamb – Earth scientist and professor of geography in the School of Geography, Environment and Earth Sciences at Victoria University at Wellington, New Zealand.   Author of “The Oldest Rocks on Earth: A Search for the Origins of Our World.” Big Picture Science is part of the Airwave Media podcast network. Please contact advertising@airwavemedia.com to inquire about advertising on Big Picture Science. You can get early access to ad-free versions of every episode by joining us on Patreon. Thanks for your support! Learn more about your ad choices. Visit megaphone.fm/adchoices