This 3,000-foot wide extinct volcano shaped Easter Island’s southwestern profile around 2.5 million years ago. Its freshwater lake—the island’s largest—was a main source of water for ancient Orongo ...

How archaeologists are rediscovering the ancient world's most marvelous monuments The canonical Seven Wonders of the Ancient World were renowned for their size or splendor and—in all cases—the ...

Natural products are small molecules produced naturally by any organism including primary and secondary metabolites. They include very small molecules, such as urea, and complex structures, such as ...

The semicircular waterfall at the heart of this site is some 80 m high and 2,700 m in diameter and is situated on a basaltic line spanning the border between Argentina and Brazil. Made up of many ...