Book excerpt: In his final work, the great and beloved Native American scholar Vine Deloria Jr. takes us into the realm of the spiritual and reveals through eyewitness accounts the immense power of medicine men. The World We Used To Live In, a fascinating collection of anecdotes from tribes across the country, explores everything from healing miracles and scared rituals to Navajos who could move the sun. In this compelling work, which draws upon a lifetime of scholarship, Deloria shows us how ancient powers fit into our modern understanding of science and the cosmos, and how future generations may draw strength from the old ways.