After flying by Pluto, a NASA probe is on its way to another world that could unlock insights into the creation of our solar system. Find out what's next for New Horizons. Mental health is often at the center of political and social debates. The tireless dedication of an Indian psychiatrist has helped revolutionize the field of worldwide mental health. Also: Does Pluto have a long-lost twin? And there's mystery in Senegal: The country's cash crop is making people sick—sometimes fatally. Can scientists find a solution?
Plus: The life and death of the world's largest living organism, animal mummies and the truth about "good" cholesterol. All this and more in the December issue of Discover.