The ISS, Captured By Discovery September 2009 NASA From Popular Science:
It's a bit cliché to kick off a story about NASA with "Houston, we have a problem," but seriously, they've got a problem: the plumbing on the International Space Station is clogged, and NASA isn't exactly sure why, or how to fix it. To clarify, it's not the actual toilet component that's broken, but the $250 million system designed to recycle astronauts' urine, sweat, and exhaled vapor into clean, potable water.
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