How to start spelunking in South Dakota With more than 100 known caves, Black Hills spelunking excursions run the gamut.

Two companies are seeking financial guarantee for as much as $500 million from state officials to build a pipeline moving natural gas from North Dakota's oil fields to the east.

FUJAIRAH, United Arab Emirates — The humble road rumble strip, used around the world to alert drifting drivers to potential hazards or lane departures, can play Beethoven on a mountain highway in the ...