The International Space Station is just as gross as your own home

When you think of the International Space Station -- that huge floating laboratory cruising through Earth's atmosphere that has housed dozens of different astronauts and cosmonauts over the years -- what image does your mind paint? If it's a picture of pristine, almost clinical cleanliness, far away from the grime that you already know covers your kitchen counters and couch cushions, you should think again. A new study published in the journal PeerJ reveals that the inside of the International S...