The international race to develop biological weapons during the 20th century.
Though first seen only as an expensive luxury, Alexander Graham Bell's telephone soon transformed American life and became a necessity.
She set out to save a species… us.
The historic journey of Apollo 8 captivated the world in 1968 -- a bright spot in a year marked by political assassinations, race riots, and the Vietnam War.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
Engineer James Eads tamed the mighty Mississippi, turning New Orleans into the second largest port in the nation.
Robert Noyce's invention of the microchip launched the world into the Information Age.
Equipment failure, human error and bad luck led to the country's worst nuclear accident in 1979.