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An ISS mishap that almost killed an astronaut last year happened because of a clogged spacesuit filter: http://on.natgeo.com/OHbl7a
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Photo of the Day: Through a Glass, Colorfully http://on.natgeo.com/1fIDkN9 #pod #photography
The secret lives of reef sharks: http://on.natgeo.com/1hFoC8q