Romanian postage stamp issued in 1960 featuring an illustration of a nuclear reactor.

Romanian postage stamp from 1957, commemorating the centennial of medical and pharmaceutical education in Bucharest and the National Congress of Medical Sciences. The stamp features portraits of Nicolae Crețulescu…

Polish stamp issued in 1973 for the Second Congress of Polish Science in Warsaw. The stamp features a stylized flame in the colors of the Polish flag rising from a book.

Stamp commemorating the 2nd International Pharmacological Congress in Prague, Czech Republic.

Romanian stamp commemorating geologist Gheorghe Munteanu Murgoci (1872-1925) and the International Congress of Soil Science.

Soviet Union postage stamp commemorating the First Congress of the International Federation of Automatic Control (IFAC), which first took place in Moscow, Russia. The stamp features the Tower of the University of Moscow…

Austrian postage stamp commemorating the International Pharmaceutical Federation Congress. The stamp features an illustration of an apothecary scale.

Philatelic First Day Cover commemorating the life and accomplishments of Marie Skłodowska Curie (1867-1934), the Polish-French physicist and chemist who pioneered radioactivity research and who discovered the elements…

Turkish stamp commemorating Marie Skłodowska Curie (1867-1934). This stamp, issued in 1935, was the first stamp to honor the life and accomplishments of Curie, physicist and chemist who pioneered radioactivity research…

Two stamps from Surinam commemorating Marie Skłodowska Curie (1867-1934), a Polish-French physicist and chemist who pioneered radioactivity research and who discovered the elements polonium and radium. Curie was the…

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.