To time how fast a sprinter runs, you just need a stopwatch. To time how fast magma moves, you need to know a little bit about chemistry.

A new species of shark has been discovered a Mammoth Cave National Park, where fossil records have revealed more than 70 species of shark that swam in the ocean when this part of present-day Kentucky was under water about 340 million years ago.

An Arizona Republican wants to give the Border Patrol unfettered access across official wilderness, and potential wilderness, in Big Bend National Park and Organ Pipe Cactus National Monument in an effort to reduce illegal immigration.

Roughly a third of the National Park Service's senior leadership positions are vacant, and the Interior Department reportedly has told the agency it will not be able to fill them.