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The Importance of Gravity in Life
During his first spacewalk, John Grunsfeld was blinded in one eye by contaminated water. "I've lost one of my five senses, probably the most important one," he says. He and fellow astronaut Scott Przimsky decided to open up a purge valve on their suits so that polluted air could be blown out into space. The move worked for a while but eventually had to be stopped because it wasn't diluted enough.