What’s The Longest You Can Possibly Live?

Over the last 100 years humans have doubled their life expectancy. How did we make that happen? Steven Johnson is host of the PBS/BBC series “How We Got to Now,” and the “American Innovations” podcast. He joins host Krys Boyd to talk about societal change that has pushed us to live older, fuller lives and why that’s dependent on the greater good. His book is “Extra Life: A Short History of Living Longer.”