This clear, candid, and generously illustrated book is written for the open-minded reader who does not understand the technical issues of evolution, but would like to, who sees everywhere the signs of a bitter political, philosophical, and educational debate, but does not know what to make of it or who to believe. It tells how science proceeds, what evolution is, how science knows that it has occurred and continues to occur, and what biologists can point to, in fossils and in the living world, as hard evidence of evolution. For its content and foundations, the book draws on zoology, botany, genetics, embryology, geology, geophysics, cosmology, astronomy, astrophysics, history, religion, and science education - everything expressed with a clarity that enables the general reader without a science background, as well as high school students and their teachers, to understand the argument.