How can science teach us that animals feel no pain when our common sense observations tell us otherwise? Bernard Rollin offers welcome insight into questions like this in his ground-breaking account of the difficult and controversial issues surrounding the use of animals. He demonstrates that the denial of animal consciousness and animal suffering is not an essential feature of a scientific approach, but rather a contingent, historical aberration that can and must be changed if science is to be both coherent and morally responsible. Widely hailed by advocates of animal welfare and scientists alike on its first appearance, the book now includes an epilogue by the author describing what has changed, and what hasn’t, in this use of animals in scientific research and food production.