Elijah Wald es escritor y m�sico con veinte a�os de experiencia reportando sobre los or�genes musicales y sobre la m�sica misma en diferentes regiones del mundo. Fue escritor y asesor para el proyecto de m�ltiples medios del Instituto Smithsonian llamado The Mississippi: River and Song (El R�o Mississippi: el r�o y su m�sica), y tambi�n recibi� un premio por la biograf�a Josh White: Society Blues (Josh White, Blues de la Sociedad). Una sobrevista de su obra se puede conseguir en elijawald.com.Elijah Wald is a writer and musician with twenty years experience covering roots and world music. He was writer and consultant on the Smithsonian multimedia project The… Mississippi: River of Song, and is the author of the award-winning biography Josh White: Society Blues.Paul Showers wrote twenty books for the Let's-Read-and-Find-Out Science series, including favorites such as What Happens to a Hamburger? and Where Does the Garbage Go? Mr. Showers worked on the Detroit Free Press, the New York Herald Tribune, and for thirty years, the Sunday New York Times.