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Civil engineering is not a uniquely human pursuit. Throughout the ocean, from slime growing in the sunny shallows to colonies of life surrounding seafloor hydrothermal vents, microbes produce their own construction materials and build their own environments. Some of the most productive tiny architects are iron-oxidizing bacteria-microorganisms that process iron for energy, and in doing so, create complex structures made of rust. [Source: Bigelow Laboratory for Ocean Sciences]
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