Why are six people living in a geodesic dome on the slopes of a volcano in Hawaii? Passage: "Right now, six people are living in a nearly windowless, white geodesic dome on the slopes of Hawaii’s Mauna Loa volcano. They sleep in tiny rooms, use no more than eight minutes of shower time a week and subsist on a diet of freeze-dried, canned, or preserved food. When they go outside, they exit through a mock airlock, clad head to toe in simulated spacesuits. The dome’s occupants are playing a serious version of the game of pretend—what if we lived on Mars?"