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Zika virus

ON THE MOVE  Researchers used genetic information from Zika virus (illustrated) to follow its spread among affected regions in South and Central America and the Caribbean.

aerial view of Trichodesmium microbes

SEA CHANGE  A rethink of earlier studies suggests trouble ahead for a major player in ocean nutrient cycles, the nitrogen-fixing Trichodesmium microbes, which can grow in abundance as seen is this image (pale streaks).


SOLAR POWERED  Ancient cyanobacteria, much like these modern-day ones, expelled oxygen into Earth’s atmosphere as a byproduct of photosynthesis, perhaps as early as 3.2 billion years ago.

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