Protective structures can help save properties from erosion, but by blocking the natural flow of sand and sediment, they can accelerate erosion elsewhere.
Soldiers lie sick with Spanish influenza at Fort Riley, Kansas. The virus would claim the lives of 50 million people, 3 percent of the world's population at the time.
Psychiatrist Nassir Ghaemi explains why a mentally ill president may be just what we need, and how mania and depression have driven the triumphs and the tragedies of Lincoln, Churchill, Hitler, JFK...
