Retired astronaut Scott Parazynski talks risky spacewalk, the top of Mt Everest & more https://t.co/eWoJLVHiYc http://pic.twitter.com/U6ni3Lo4AG
— Popular Science (@PopSci) December 12, 2015
via Twitter https://twitter.com/PopSci
December 12, 2015 at 02:30PM
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