How would you reinvent something that’s been used for thousands of years, by millions of people? In this episode, we discover the process of invention with Rory Cooper, an engineer who revolutionized the wheelchair. He’s our guide to time traveling back to the kings and queens who used wheelchairs, and to the future of rideable robots. Anyone want a ride on a Mars rover?! Listen to more of our interview with Rory Cooper, when you become a member on Patreon! Just $1/month gets you access to our special bonus interview episodes with all our scientists. Pledge at patreon.com/tumblepodcast.  Watch videos of Rory’s wheelchairs (including the waterpark wheelchair in action!) at our website, sciencepodcastforkids.com.