A Map Of The U.S., If There Had Never Been A Mexican-American War

In 1846, President James Polk, driven by a belief in Manifest Destiny, waged a war to seize land from Mexico and expand the nation's boundary from Texas to California. But events could have plausibly gone very differently, resulting in a map of the U.S. that would be significantly unlike the one we have today. » 7/30/14 7:40am 7/30/14 7:40am

After 15 Years of Study, a New Theory of What Causes Fairy Circles

In Namibia, at the boundaries between grassland and desert, a strange phenomenon has puzzled people for centuries. Mysterious circles of barren land form in the middle of rich, thick grasses. Dubbed "fairy circles," their formation has been attributed to everything from termites to poison gas. Now, a group of… » 5/20/14 8:44am 5/20/14 8:44am