Global warming may reveal a secret U.S. nuclear base buried under Greenland’s icecap. Now that the Rosetta spacecraft is offline, we take a look back at what it taught us about comets. Plus, thousands of women in Saudi Arabia have signed a petition to abolish the male guardianship system. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.