George Eastman introduced the Kodak and Brownie camera systems and transformed photography into something anybody could do.
The effort of pioneering researchers to conceive babies through in vitro fertilization.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
Brothers Wilbur and Orville Wright built a flying machine that made its first flight in Kitty Hawk, North Carolina in 1903.
After 18 years of struggles, the Golden Gate Bridge opened on May 27, 1937.
"The Wizard of Menlo Park," Inventor Thomas Edison, built the first practical light bulb and revolutionized the world.
Though first seen only as an expensive luxury, Alexander Graham Bell's telephone soon transformed American life and became a necessity.
Robert Moses fueled some of the most ambitious -- and controversial -- public works projects ever conceived.