Mercury exposure threatens brain, heart, and environmental health. Learn how it enters our bodies, why it’s dangerous, and ...

In Search of Freshwater, photographer M'hammed Kilito's images showcase the importance and fragility of humanity's ...

Between 50 and 100 kilometers (30–60 miles) above the Earth's surface lies a largely unstudied stretch of the atmosphere, ...

New research has uncovered compelling evidence that water from a comet is strikingly similar to that found in Earth's oceans, ...