Dr. Alfred Crosby, author of Epidemic and Peace 1918: America's Forgotten Pandemic.
Though first seen only as an expensive luxury, Alexander Graham Bell's telephone soon transformed American life and became a necessity.
Major Walter Reed's discovery in 1900 that mosquitoes spread yellow fever halted an outbreak and led to the disease's eventual eradication.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
Politics, culture, race relations, and technology in a year of change.
The unusual life of David Vetter, who lived permanently inside a germ-free environment due to severe combined immunodeficiency.
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.
The effort of pioneering researchers to conceive babies through in vitro fertilization.
After 18 years of struggles, the Golden Gate Bridge opened on May 27, 1937.