Valerie Jarrett has some advice for Democrats running in 2020
Recode Decode, hosted by Kara Swisher
Caleb Scharf: Living on Mars is complicated, actually
Caleb Scharf, the director of Astrobiology at Columbia University, talks with Recode's Kara Swisher about the under=discussed dangers humans would face in space and the rise of private space exploration, as championed by billionaires such as Elon Musk and Richard Branson.
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