When students arrive at Shoals Marine Laboratory on Appledore Island, Maine, many are chagrined to learn that they are restricted to two showers per week. In addition, those showers are taken in infamous "military style"—no basking in warm water coursing over their bodies after a long day hopping from rock to rock and slogging through cold, salty waves. Instead, they turn on the water only when needed. Not their usual style of bathing. And the water in the toilets? Not freshwater, but salt.