Evolutionary science lies at the heart of a modern understanding of the natural world. Darwin's theory has withstood 150 years of scientific scrutiny, and today it not only explains the origin and design of living things, but highlights the importance of a scientific understanding in our culture and in our lives. Recently the movement known as "Intelligent Design" has attracted the attention of journalists, educators, and legislators. The scientific community is puzzled and saddened by this trend-not only because it distorts modern biology, but also because it diverts people from the truly fascinating ideas emerging from the real science of evolution. Here, join fifteen of our preeminent thinkers whose clear, accessible, and passionate essays reveal the fact and power of Darwin's theory, and the beauty of the scientific quest to understand our world.