Hadfield demonstrates Microbial Air Sampling on the ISS

The International Space Station crews about 3 6 people at a time, but sometimes unwelcome guests appear in the form of bacteria. To keep the world s largest orbital laboratory clean, Commander Chris Hadfield uses a floating microbial air sampler to test for nasties. Watch until the end to see what he finds Credit: CSA, NASA To learn more about living in space, go to: