Amazon River Flowed Backwards in Ancient Times (SPACE.com / LiveScience.com)

Ker Than LiveScience Staff Writer LiveScience.com Thu Oct 26, 12:30 PM ET South America's winding Amazon River flows in an easterly direction across the continent, dumping water into the Atlantic Ocean. But in eons past, it flowed from east-to-west and, for a time, in both directions at once, a new study finds. About 100 million years ago, during the middle of the Cretaceous Period when dinosaurs still walked the Earth, the continents of South America and Africa broke apart. The fissure created ...