We can learn a lot by exploring the edges of the biosphere, where conditions can just barely support even the most hardy organisms. And by venturing beyond the biosphere– by leaving Earth and traveling into space– we can really test the limits of what our bodies are capable of.  Scott Parazynski is a former NASA astronaut who has flown on five missions to space and completed seven spacewalks. He is also an emergency medical doctor who has climbed some of the highest mountains on Earth, including Everest, a scuba diver, pilot, rock climber, and luge athlete.  Scott describes what it’s like to live and work in space, his journey toward becoming an astronaut, and what being in space and other extreme environments has taught him about Earth and about the limits of the human body. To learn more about Scott Parazynski, check out his book “The Sky Below” and his website:  https://parazynski.com/ You can learn more about space science and exploration at https://www.nasa.gov/ Mentioned in this episode: Lindblad Expeditions The Rice Alumni Traveling Owls program offers exciting intellectual itineraries to destinations across the globe. Traveling Owls trips serve as a catalyst for lifelong learning and strengthen bonds between Rice University alumni and friends. You don’t have to be a Rice alum to participate in Traveling Owls programs. Visit alumni.rice.edu/travelingowls to see a list of upcoming trips. Rice Traveling Owls Lindblad Expeditions