During World War II, more than a thousand women signed up to fly with the U.S. military as WASPS.
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.
In 1960, Francis Gary Powers' U-2 spy plane was shot down over the Soviet Union.
Major Walter Reed's discovery in 1900 that mosquitoes spread yellow fever halted an outbreak and led to the disease's eventual eradication.
At the height of segregation, an unlikely alliance between a black medical genius and a white surgeon led to a pioneering medical breakthrough.
The first around-the-world air race was sponsored to prove that the airplane had a commercial future.
The remarkable story of how a railroad was built connecting California to the East.