It's an incredibly exciting time to be alive, especially if you're an explorer. We may have been to almost every point on the globe, but there is so much left to understand.
Scott Parazynski is the only person in history to have both flown to space and summited Mount Everest. He's seen more of this world than most, and some of what lies beyond it—so what is it about adventure that draws people like him in? Parazynski thinks it's innate curiosity that drives us, but that the more we explore the more we gain other reasons to keep going. Humanity has benefitted enormously from pursuing "moon shots"—like the Apollo missions—and NASA's research in particular has pushed our capacity for innovation, resulting in spin-off technologies that create new industries and change people's daily lives (3D printed food, invisible braces, memory foam, scratch resistant lenses, the DustBuster—come on!). Why keep your feet planted on Earth, or your mind planted in the known, when there could be life under the ice-encrusted oceans of Enceladus or Europa, a new home waiting for us on Mars, and technology on the horizon that will connect a surgeon in New York City with a person in danger in rural Nepal? Scott Parazynski is the author of The Sky Below: A True Story of Summits, Space, and Speed.