Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate Watch more at http://pbs.org/yearinspace Tweet this ⇒ http://bit.ly/OKTBSyis Share on FB ⇒ http://bit.ly/OKTBSyisFB ↓ More info and sources below ↓ Dig deeper: National Research Council. “Space Radiation Hazards and the Vision for Space Exploration: Report of a Workshop.” Washington, DC: The National Academies Press, 2006. doi:10.17226/11760. NASA Facts “Understanding Space Radiation” http://spaceflight.nasa.gov/spacenews... Cucinotta, Francis A., and Marco Durante. "Cancer risk from exposure to galactic cosmic rays: implications for space exploration by human beings."The lancet oncology 7.5 (2006): 431-435. Crucian, Brian, et al. "Alterations in adaptive immunity persist during long-duration spaceflight." npj Microgravity 1 (2015). Durante, Marco, K. George, and F. A. Cucinotta. "Chromosomes lacking telomeres are present in the progeny of human lymphocytes exposed to heavy ions." Radiation research 165.1 (2006): 51-58. Smith, Scott M., et al. "Benefits for bone from resistance exercise and nutrition in long‐duration spaceflight: evidence from biochemistry and densitometry." Journal of Bone and Mineral Research 27.9 (2012): 1896-1906. Reddit AMA with Dr. Susan Bailey - telomere twin study research leader: https://www.reddit.com/r/IAmA/comment... Space Station Live - interview with Dr. Susan Bailey null. Space Station Live - science of the gut null. Currently funded crew health research proposals: http://www.nasa.gov/content/nasa-and-... Footage courtesy of NASA and PBS unless otherwise noted Have an idea for an episode or an amazing science question you want answered? Leave a comment or check us out at the links below! Follow on Twitter: http://twitter.com/okaytobesmart http://twitter.com/drjoehanson Follow on Tumblr: http://www.itsokaytobesmart.com/ Follow on Instagram: http://instagram.com/drjoehanson ----------------- It’s Okay To Be Smart is written and hosted by Joe Hanson, Ph.D. Follow me on Twitter: @jtotheizzoe Email me: itsokaytobesmart AT gmail DOT com Facebook: http://www.facebook.com/itsokaytobesmart For more awesome science, check out: http://www.itsokaytobesmart.com/ Produced by PBS Digital Studios: null. Music via APM Stock images from Shutterstock, stock footage from Videoblocks (unless otherwise noted)