Dr. David Sinclair, a Harvard geneticist and author of the book "Lifespan," has been researching some of life's biggest questions. In this episode he reveals that we have the technology to live happy and healthy lives to 200 years old. He joins Lewis to discuss whether science will eventually enable humans to live forever, how we might be able to bring people back from the dead, and why it's a "certainty" that aliens exist. If you liked David's first interview on the School of Greatness, then you'll love this deeper conversation. Click on the title to read the full review and listen to this episode.