August 1, 2014; 4:58 AM ET
A wildfire that has already destroyed more than 60 structures is threatening more in the Sierra Nevada foothills near Plymouth, California, according to state fire officials. more >
A new video gives an extended look at the record-breaking first test flight by a company that aims to begin lofting passengers on balloon cruises to near-space by 2016.
Hikers in Colorado's Rocky Mountain National Park are taking precautions after two visitors were killed by lightning strikes in recent days.