Discovery News: A new year has started, but last year's drought is still afflicting the United States. The latest map from the U.S. Drought Monitor shows nearly 73 percent of the contiguous U.S. is still in drought. Rain has slaked the thirst of parts of the Northeast and Southeast, but dry conditions expanded in other regions. The southern Mississippi Valley recently received rainy relief as a belated Christmas present, but the northern stretches of the Mississippi and Missouri Rivers and their headwaters remained...