JACKSON, UNITED STATES: Riders raise their arms as they travel the "Kingda Ka" roller coaster 19 May, 2005, at Six Flags amusement park in Jackson, New Jersey. The roller coaster is billed as the tallest at 456 feet (139 meters) and fastest, 128 mph (205 kph) on the Earth. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) Stan Honda/AFP/Getty Images hide caption

itoggle caption Stan Honda/AFP/Getty Images

As Florida temperatures hover in the 90's, boys use a swing rope to cool off in the Suwannee River near Chiefland, Fla. Phil Sandlin/AP hide caption

itoggle caption Phil Sandlin/AP