Mar 8, 2013 — Why do people in Boston get the flu when it's cold, while people in Senegal get sick when it's hot? Humidity is a big part of the explanation. But how flu spreads in the tropics and more temperate climates appears to be different.
Jul 17, 2012 — "Moderate to extreme" drought conditions already exist in about 55 percent of the continental U.S. No relief is in sight. There are warnings this could be one of the 10-most expensive weather disasters in U.S. history.