Though first seen only as an expensive luxury, Alexander Graham Bell's telephone soon transformed American life and became a necessity.
"The Wizard of Menlo Park," Inventor Thomas Edison, built the first practical light bulb and revolutionized the world.
The effort of pioneering researchers to conceive babies through in vitro fertilization.
The Pennsylvania Railroad Company accomplished an enormous engineering feat, but destroyed a great architectural monument.
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 Noyce's invention of the microchip launched the world into the Information Age.
Engineer James Eads tamed the mighty Mississippi, turning New Orleans into the second largest port in the nation.