1983 20¢ Science and Industry stamp
September 20, 1848

American Association for the Advancement of Science

The American Association for the Advancement of Science (AAAS) was founded on September 20, 1848, in Philadelphia, Pennsylvania. It grew to become the world’s largest general scientific society with more than 120,000 members.

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1940 5¢ Walter Reed stamp
September 13, 1851

Happy Birthday, Walter Reed

Major Walter Reed, M.D., was born on September 13, 1851, in Belroi, Gloucester County, Virginia.  Reed confirmed the theory that yellow fever was spread by particular mosquito species.  This led to decreased cases and a treatment, which ultimately saved countless lives in the building of the Panama Canal.

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1998 32¢ Celebrate the Century - 1920s: Radio-America stamp
August 20, 1920

Early Commercial Radio

On August 20, 1920, Detroit’s 8MK radio station began daily broadcasts. Still in operation today, the station often claims to be the first commercial radio station, though a few others have also staked their claim on that title.

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2000 World Wide Web stamp
August 6, 1991

The World Wide Web

On August 6, 1991, Tim Berners-Lee published the first-ever website, heralding the start of the world wide web. The web has grown to over 1.8 billion websites today, and continues to grow every day.

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1989 $2.40 Moon Landing stamp
July 20, 1969

U.S. Lands First Men On The Moon

On July 20, 1969, the US effectively won the Space Race when Neil Armstrong and Buzz Aldrin landed the Eagle lunar module on the Moon’s surface.  

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1993 Percy Julian stamp
April 11, 1899

Birth of Percy Lavon Julian

Chemist Percy Lavon Julian was born on April 11, 1899, in Montgomery, Alabama. Julian was one of the first African Americans to receive a doctorate in chemistry, and the first to be inducted into the National Academy of Sciences. He owned more than 100 chemical patents and was a pioneer in chemical synthesis of drugs used in medicine.

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1983 Charles Steinmetz stamp
April 9, 1865

Birth of Charles Steinmetz

Mathematician and electrical engineer Charles Proteus Steinmetz was born Karl August Rudolph Steinmetz on April 9, 1865, in Breslau, Province of Silesia, Prussia (present-day Wrocław, Poland). Steinmetz developed the electrical theories that allowed for the expansion of the electric power industry. He was also known as the “Forger of Thunderbolts” and the “Wizard of Schenectady.”

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2011 Melvin Calvin stamp
April 8, 1911

Birth of Melvin Calvin

Biochemist Melvin Calvin was born on April 8, 1911, in St. Paul, Minnesota. He earned the 1961 Nobel Prize for Chemistry for his discover of the Calvin cycle – the conversion of carbon dioxide into organic molecules during photosynthesis.

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Merian Botanicals stamp
April 2, 1647

Birth of Maria Sibylla Merian

Naturalist and artist Maria Sibylla Merian was born on April 2, 1647, in Frankfurt-am-Main, Germany. Merian spent her life studying insects and plants and capturing them in beautifully detailed paintings and drawings.

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