The Silurian Hypothesis asks whether signs of truly ancient past civilizations would even be recognisable today.

Since 1963 the Glen Canyon Dam has obstructed the flow of water and accompanying sand into the Grand Canyon via the Colorado River. In response the Glen Canyon Dam Adaptive Management Program ...

A single day at Grand Canyon is well worth your time. This itinerary has the highlights. Park your car and ride the shuttles to the best scenic views and historical locations. Numerous activities ...

From a train running on used french fry oil to restaurants feeding mules with food scraps, Grand Canyon National Park is a leader in waste reduction. Emily Hochberg has over 15 years of experience ...

A groundbreaking study led by Texas's Southern Methodist University (SMU) has confirmed what the people of Picuris Pueblo have long known: they are direct descendants of the ancient Chacoan ...