Astronaut Scott Kelly made himself a guinea pig for all the people who dream of human journeys to Mars and other destinations in space. In 2015, Kelly rode a rocket into space and spent nearly a year...
from NDTV News - Top-stories http://bit.ly/2UWhYbq
Friday, April 12, 2019
NASA's Celebrated "Twins Study" Shows What Spaceflight Does To Human Body
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