Scientists who work for nuclear waste disposal projects in Finland, Canada and Sweden study an ice sheet in western Greenland. Courtesy of Vincent F. Ialenti hide caption

itoggle caption Courtesy of Vincent F. Ialenti

The Star-Spangled Banner, played before every baseball game, has become so tied to the sport that an old joke asks, "What are the last two words of the national anthem?" and answers, "Play ball!" Michael Dwyer/AP hide caption

itoggle caption Michael Dwyer/AP