Stratospheric polar vortex changes still trigger brutal U.S. winter cold snaps and extreme weather despite a warming climate.

There was plenty of motivation for Keelan Harvick to find his way to Cook Out Victory Lane at Hickory Motor Speedway on ...

At 3,985 feet, the peak is just under 4,000 feet above sea level, and the hike up via Tunnel Trail and a half-mile stretch of ...