Word: algal
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Dates: during 1960-1969
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...reappeared only when man brought it back with him in the mud and dirt of his shoes. Palmellococcus' life was made all the more comfortable when man installed artificial lights in the cave, circulated the air with huge blowers and, most important of all, introduced a host of algal nutrients...
...recycle the precious oxygen in spaceships is a venerable idea, but it is far easier to accomplish in fiction than in fact. Many space-minded companies have added algologists to their staffs, but Boeing believes it is the first to keep a man alive for a full day on algal oxygen. The original air in McClure's tank would have become unbreathable in a short time. But as soon as the door closed, pumps started bubbling the air through the columns of illuminated algae...