Norman Maclean wrote the beautiful novella-- A River Runs Through It --as an allegory on the power of water. He would have been impressed by a discovery in Brazil that shows the mega-force of a river. The Amazon is the world's second longest river. It stretches east-west across South America. The river's watershed drains an area nearly 3 million square miles wide and accounts for approximately twenty percent of the world's total flowing water. Now Brazilian researchers report finding a ...