In this issue: "The Ethics of Climate Change": Weighing our own prosperity against the impact of climate change on our grandchildren's lives requires economists to make tough calls. "The Tunguska Mystery": What could a mysterious explosion in a Siberian forest 100 years ago have to do with the future of our planet? "Gaining Ground on Breast Cancer": The newest targeted therapies are helping doctors to tailor increasingly effective treatments to individual patients. "The Neurobiology of Trust": Our inclination to trust a stranger stems in large part from exposure to a small molecule known for an entirely different task - inducing labor. "What Is a Species?" A better definition can influence which animals make the endangered list.
©2008 Scientific American