The dangers of space exploration are all too clear. Last month we observed the 50th anniversary of the Apollo 1 disaster -- a cabin fire during launch rehearsals which claimed the lives of all three crew.
원문출처 : http://www.cnn.com/2017/02/09/health/my-hero-sanjay-gupta-kelly-twins/index.html
원문출처 : http://www.cnn.com/2017/02/09/health/my-hero-sanjay-gupta-kelly-twins/index.html