Science

 US #2222 – from the Arctic Explorers Set
November 3, 1879

Happy Birthday Vilhjalmur Stefansson

Arctic explorer Vilhjalmur Stefansson was born on November 3, 1879, in Manitoba, Canada. 

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 US #1473 was issued for the 120th anniversary of the founding of the APhA.
October 6, 1852

American Pharmaceutical Association

On October 6, 1852, the American Pharmaceutical Association (APhA) was founded in Philadelphia, Pennsylvania.

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 US #2170 from the Great Americans Series.
June 6, 1886

Dr. Paul Dudley White

Doctor Paul Dudley White was born on June 6, 1886, in Roxbury, Massachusetts.

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1973 8¢ Progress in Electronics: Transistors and Printed Circuit
May 23, 1908

Birth of John Bardeen

Physicist John Bardeen was born on May 23, 1908, in Madison, Wisconsin.

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 US #949 pictures a reproduction of Sir Luke Fildes’ painting, The Doctor.
May 7, 1847

The American Medical Association

On May 7, 1847, the American Medical Association (AMA) was founded, thanks in large part to Nathan Smith Davis.

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 US #1469 was issued for the AOA’s 75th anniversary.
April 19, 1897

The American Osteopathic Association

On April 19, 1897, the American Osteopathic Association was formed.

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 US #1387-90 were issued to commemorate the 100th anniversary of the museum’s opening.
April 6, 1869

The American Museum of Natural History

On April 6, 1869, the American Museum of Natural History is established in New York City. 

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 US #2038 was issued for Priestley’s 250th birthday.
March 24, 1733

Birth of Joseph Priestley

Joseph Priestley was born on March 24, 1733, in Birstall, West Riding of Yorkshire, United Kingdom.

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Colorano Silk Cachet Combination First Day Cover.
March 23, 1699

Birth of John Bartram 

Botanist John Bartram was born on March 23, 1699, in Darby, Pennsylvania Colony.

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