A cholesterol result often arrives as a set of numbers with unfamiliar labels, and it is understandable to feel unsure what any of them mean.

Dust is the defining weather hazard of Mars.

Sensors that continuously measure gases escaping from volcanoes are giving observatories earlier warnings that magma is rising toward the surface,.

For many people, the first minutes of the day arrive with stiff shoulders, a tight back and a general sense of moving slowly.

Walkers returning to famous glacier valleys after a decade away often describe the same surprise: the ice that once reached the trailhead now lies.