This one-ton turtle once ruled South America’s rivers — until a changing planet proved too much for even the largest ...

Microscopic ocean algae produce a huge share of Earth’s oxygen—but they need iron to do it. New field research shows that ...

New method reveals chemical signs of early microbial life in ancient Earth rocks, showing photosynthesis evolved much earlier ...

Ocean microbes keep the planet healthy by cycling nutrients and capturing carbon, but a detailed and precise map of where ...