Frank Whittle, an English engineer with the Royal Air Force filed the first patent for a het engine in 1930, but the first country to fly a jet engine plane was Germany, which performed a test flight of its model on August 27, 1939.
The first Allied plane to use jet technology took flight on May 15, 1941. Though they didn't have much of an impact on the war, but jet engines later would transform both military and civilian transportation.
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4. BLOOD PLASMA TRANSFUSION
During the war, an American surgeon named Charles Drew standardized the production of blood plasma for medical use.
Unlike blood, plasma can be given to anyone regardless of a person's blood type, making it easier to administer on the battlefield.
--Cooter
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