Inca wall, Peru. So, how to explain the sweet potato and superb stonework? It may be that the Polynesians sailed as far as South America in their migratory explorations, and then, some time later ...

11,000-feet above sea level in Peru, Gordon meets a “mad potato scientist,” cooks in ... More than 500 years ago, this region was the heart of the Inca Empire. While many things have changed ...