Researchers have discovered a fundamental mechanism that affects the size of the pupil, namely our breathing. The study shows that the pupil is smallest during inhalation and largest during exhalation ...

The winning image, shot with a fish-eye lens from a a rocky shelf on the Lake Michigan shore, topped a record 770-plus entries in the annual contest.

From Arizona's canyons to Utah's buttes and beyond, our national parks columnist shares the most adventurous Southwest ...