"The Wizard of Menlo Park," Inventor Thomas Edison, built the first practical light bulb and revolutionized the world.
The international race to develop biological weapons during the 20th century.
The most daring and innovative accomplishment at the turn of the 20th century.
Equipment failure, human error and bad luck led to the country's worst nuclear accident in 1979.
The internationally famous carnival of delights in New York was the birthplace of the hot dog and the roller coaster.
Engineered by William Barclay Parsons, the 21-mile, four-track route of the New York City Subway was the largest public works project in history.
Robert Moses fueled some of the most ambitious -- and controversial -- public works projects ever conceived.
George Eastman introduced the Kodak and Brownie camera systems and transformed photography into something anybody could do.