In Cosmic Bullets leading cosmic ray experts Roger Clay and Bruce Dawson tell the incredible story of the discovery and study of these messengers from deep space. They point out that despite a century of intensive research, it is still far from certain where most cosmic rays come from or how they were created. Nevertheless, the little-known story of their discovery and subsequent study holds many sudden twists and wonderful surprises. The authors have captured the excitement and mystery of astrophysical research, and the human drama of science, in this story of discovery.