
The International Space Station is like no other place on Earth, and not just because it's not actually on Earth at all. The orbiting laboratory is inhabited by crews of scientists that live there for months before being changed out for fresh faces, and this poses a huge challenge when it comes to cleanliness. It's not that astronauts are any messier than the rest of us, but they're definitely still human, and being human means carrying a whole host of microorganisms with you on a daily basis. R...
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