Space travel to Mars is coming: “It’s the backup plan for humanity”

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Travel to Mars is coming sooner than we think, says Christopher Mason, associate professor at Weill Cornell Medicine. Mason worked on NASA’s twin study to analyze the impact of space travel on human DNA and apply what was learned here on Earth. Ana Maria Montero finds out how Mason is using DNA to improve lives and his work with ETH and the University of Zurich to map the DNA of Swiss cities.