This looped and knotted section of cords is not only beautiful, it's also a 500-year old mathematical tool.
Archaeologists working in Peru have discovered 25 well-preserved quipus, an ancient string-based device used to solve mathematical problems and to assist in record-keeping.
The most powerful civilization in South America before the arrival of Europeans was the mighty Inca empire, which ruled much of the continent's Pacific coast from their home in the Peru highlands. And it's all thanks to copious llama crap.
Three thousand years ago, a civilization ruled the Andes Mountains of South America. Not much is known about this pre-Incan civilization, but we do know beautifully decorated conch shells were played like musical instruments and used as parts of religious ceremonies. Now archaeologists and acousticians have teamed up…
Global warming often evokes images of melting icecaps, disappearing landmasses, and natural disasters. But the results aren't always so dire. For the Incas, global warming meant 400 years' prosperity and growth, allowing them to create a formidable empire.