‘Fool’s Gold’ is ocean life’s fertilizer: Pyrite nanoparticles from hydrothermal vents are rich source of iron in deep sea

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Similar to humans, the bacteria and tiny plants living in the ocean need iron for energy and growth. But their situation is quite different from ours -- for one, they can't turn to natural iron sources like leafy greens or red meat for a pick-me-up. So, from where does their iron come?...
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