When your roommate eats the last Oreo in the freezer, that's an annoyance. When your roommate eats the last Oreo you'll see in months, you might have a problem.

On Sept. 17, six volunteer crew members emerged from eight months of isolation. Their quarantine, part of a NASA-backed study by the University of Hawaii, could one day help humanity plan a drama-free Mars mission.

For the last eight months, the six volunteers lived in a tiny shelter on the slopes of an active volcano, sharing their living space, meager kitchen, and solitary shower.

From a distance, their house-sized habitat looked like a golf ball sitting in the loneliest sand trap in the universe. Photo from HI-SEAS V Crew/University of Hawaii News/Flickr.

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