5 Ancient Societies that Collapsed When the Water Ran Dry
From Mesa Verde to the Mayans, these ancient societies collapsed without water. ...read more
From Mesa Verde to the Mayans, these ancient societies collapsed without water. ...read more
The ability to draw from your past and imagine a possible future is called mental time travel. And it might be only unique to humans. ...read more
A miniature descendent of the Columbian mammoth once inhabited a group of islands off the coast of California — and thrived in isolation. What caused the species to disappear? ...read more