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The boundaries of biology reach farther below Earth's surface than scientists had thought possible. Research around the world is changing the way scientists think about the deep biosphere. Ten years ago, such low-life microbes were largely regarded as curiosities that represented one of the last frontiers on Earth. Now, scientists have come to appreciate these organisms as integral players in global cycles, helping to replenish key minerals in the ocean and even mediating the climate. [Source: Nature News]
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