Legionella bacteria can contaminate and grow in other water systems such as cooling towers and evaporative condensers.

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The KoolCollar also comes with a gel filled insert that you freeze and use instead of ice (minus the secondary evaporative cooling) for indoor use, to provide cooling without the dripping water.

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Those resources consist of a lot of rock, a lot of sunlight that could be used to generate electricity to process the rock and, at least in the dreams of many lunar scientists, some 20 billion tonnes of frozen water believed to lie at the bottoms of craters near the poles, where it is sheltered from the evaporative effects of sunlight.

ECONOMIST: Spaceflight