We’ve made it to our 300th weekly episode! While it’s easy to congratulate ourselves for being among the few podcasts to produce this many shows, Jim and Richard are most proud of our extraordinary range of guests.

During our first six years together, we've often highlighted out-of-the-box thinkers, who share ideas that are too rarely discussed: People who speak about solutions through an independent lens— neither firmly left nor right.

For this episode, we revisit interviews with six guests— or roughly 2% of all the people we've spoken with for "How Do We Fix It?" We begin with the public intellectual and problem solver Philip K. Howard, who was our very first guest. Others featured here are Claire Cain Miller of The Upshot at The New York Times, Mike Rowe, who became famous with the TV show "Dirty Jobs", science evangelist, Ainissa Ramirez, Jerry Taylor, President and Founder of The Niskanen Center, and R&B musician Daryl Davis, who has personally persuaded more than 200 men and women to quit white supremacist groups.

Elon Musk is an entrepreneur and out-of-this-world thinker, who has shaken up two vital industries that were dominated by giant multinational corporations with companies that began life as startups. Tesla's breakthrough with electric cars is well-known, but many of Musk's most stunning innovations have come with SpaceX, which pioneered reusable rockets— slashing the cost of space launches— flew astronauts into space, and landed rockets on boats.

Next is the development of Starship. Musk also wants to send hundreds if not thousands of humans to Mars.

Our guest, Eric Berger, is a senior editor at space and technology news website, Ars Technica, and author of the new book, "Liftoff: Elon Musk and the Desperate Early Days that Launched Space X." He takes us on a fascinating journey, as we look at the remarkable changes in the space race, and what may be coming in the next few years.