Stamp from the German Democratic Republic (DDR) commemorating Marie Skłodowska Curie (1867-1934), a Polish-French physicist and chemist who pioneered radioactivity research and who discovered the elements polonium and…

Souvenir sheet stamp commemorating the 25th anniversary of the World Health Organization (WHO). This stamp, issued in Grenada, features a portrait of Marie Skłodowska Curie (1867-1934) with the WHO symbol.

Stamp from the French Territory of the Afars and the Issas, now present-day Djibouti, commemorating Louis Pasteur (1822-1895). The stamp depicts Louis Pasteur with scientific instruments and illustrations of microbes as…

Stamp from the Comoro Islands commemorating Louis Pasteur. The stamp depicts Louis Pasteur (1822-1895) with a microscope.

Stamp from the Gabonese Republic commemorating Louis Pasteur (1822-1895). The stamp depicts Pasteur with a microscope.

Stamp and cachet depicting Louis Pasteur (1822-1895) with microbes as seen through a microscope.

Philatelic First Day Cover honoring American agricultural scientist and inventor George Washington Carver (1864?-1943). The envelope features an illustrated rendering of a hand holding a peanut as well as a postage…

Philatelic First Day Cover honoring American agricultural scientist and inventor George Washington Carver (1864?-1943). The envelope features an illustrated rendering of Carver as well as a postage stamp depicting…

Iranian stamp commemorating Avicenna (980-1037), also known as Ibn Sina, a philosopher and alchemist.

Soviet stamp commemorating Avicenna (980-1037), also known as Ibn Sina, a philosopher and alchemist.

Two stamps from Afghanistan commemorating Avicenna (980-1037), also known as Ibn Sina, a philosopher and alchemist.

Tunisian stamp commemorating Avicenna (980-1037), also known as Ibn Sina, a philosopher and alchemist.

Pakistani stamp commemorating "Health from herbs" and the contributions of Avicenna (980-1037), also known as Ibn Sina, a philosopher and alchemist.

Syrian stamp commemorating Avicenna (980-1037), also known as Ibn Sina, a philosopher and alchemist.

Polish stamp commemorating Avicenna (980-1037), also known as Ibn Sina, a philosopher and alchemist.

Deutsche Demokratische Republik (DDR) stamp commemorating Avicenna (980-1037), also known as Ibn Sina, a philosopher and alchemist.

Lebanese stamp commemorating Avicenna (980-1037), also known as Ibn Sina, a philosopher and alchemist. The stamp depicts Avicenna brewing herbs in an attempt to create the Elixir of Life.

Friedrich August Kekule von Stradonitz (1829-1896) was a German organic and theoretical chemist, whose most famous work was determining the structure of benzene. This Stamp features Kekule framed by the chemical…

1964 German stamp commemorating the 100 year anniversary of the discovery of Benzene. The stamp depicts the Kekulé structure of benzene, which was first created by August Kekulé (1829-1896) in 1865.

Stamp commemorating the 50th anniversary (Golden Jubilee) of the Philippine Pharmaceutical Association (FAPA).

Stamp from the French Territory of the Afars and the Issas, now present-day Djibouti, commemorating Marie Skłodowska Curie (1867-1934), a Polish-French physicist and chemist who pioneered radioactivity research and who…

Stamp from the Republic of Dahomey, now Benin, commemorating Louis Pasteur (1822-1895).

Soviet Union postage stamp commemorating Nikolay Nikolaevich Zinin (1812-1880), a Russian organic chemist who created a base of aniline, which he named benzidam.

Philatelic First Day Cover depicting a colorful artistic interpretation of the Phénix (French for phoenix), a small-scale prototype fast breeder reactor, located at the Marcoule nuclear site, near Orange, France. The…

Philatelic First Day Cover depicting a colorful artistic interpretation of nuclear fission or fusion initiated within the interior of the Phénix (French for phoenix), a small-scale prototype fast breeder reactor,…