Mark Stevenson, writer, comedian, and author of the new book An Optimist’s Tour of the Future: One Curious Man Sets Out to Answer “What’s Next?”, discusses his book. Stevenson calls An Optimist’s Tour of the Future a travelogue about science written for non-scientists, and he talks about why he traveled the world to try to draw conclusions about where human innovation is headed. He discusses his investigation of nanotechnology and the industrial revolution 2.0, transhumanism, information and communication technologies, and the ultimate frontier: space. Stevenson also discusses why he’s hopeful about the future and why he wants to encourage others to have optimism about the future.