For only the second time, the genome of an ancient Denisovan has been sequenced. Thanks to the discovery of a 200,000-year-old tooth found in a Siberian cave, we’re learning more about this mysterious, ancient member of the human family. Joined by special guest Bill Bryson, the team explores how this reshapes our understanding about the origins of our species. Hear the full story on The world, the universe and us, a news podcast for the insatiably curious, hosted by Rowan Hooper and Penny Sarche