Jul 17, 2013 (All Things Considered) — Astronaut Luca Parmitano's helmet malfunctioned during Tuesday's space walk outside the International Space Station. Water built up inside, causing the excursion to be abandoned. Audie Cornish talks with NPR's Geoff Brumfiel about what happened yesterday, how serious it was, and what NASA believes could be the cause of the leak.
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