Major Walter Reed's discovery in 1900 that mosquitoes spread yellow fever halted an outbreak and led to the disease's eventual eradication.
George Eastman introduced the Kodak and Brownie camera systems and transformed photography into something anybody could do.
The story of the polio crusade pays tribute to a time when Americans banded together to conquer a terrible disease.
Equipment failure, human error and bad luck led to the country's worst nuclear accident in 1979.
The Alaskan Highway stands today as one of the boldest homeland security initiatives ever undertaken.
"The Wizard of Menlo Park," Inventor Thomas Edison, built the first practical light bulb and revolutionized the world.
The worst epidemic in American history killed over 600,000 Americans during World War I.
The remarkable story of mid-19th century ingenuity and perseverance during the laying of the transatlantic telegraph cable between North America and Europe.