Two recently published studies delve into what caused the collapse of the Mayan empire, a question many archaeologists have tried answering...

The U.S...

Payments made under the Keepseagle settlement will be sped up because of the drought gripping much of the U.S., attorneys for the Keepseagle claimants announced on Wednesday...

Windmill blades spin rapidly in the stiff wind above Justin Yazzie’s ranch in Whitehorse Lake, New Mexico, slicing through a clear blue sky smudged at the edges with darkening clou...

The worsening drought has prompted the U.S...

Two-thirds of the United States is gripped in drought, the most severe bout since the 1950s, the National Climatic Data Center says in its latest report...

Scientists have found the remains of an impressive dam in the ancient Mayan city of Tikal, in Guatemala...