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

Cachet and stamp depict Max Planck, while the postmark is of Otto Lilienthal, who pioneered the use of gliders. Stamp is part of series, "Men from the History of Berlin."

Six East German postage stamps commemorating physicist and Nobel Prize Winner Max Planck (1858-1947). The red and green stamps are to celebrate the birth of Planck. The purple stamp is part of a series honoring…

Depicts a chemist with test tube and flask, as well as the chemical structure of a carboxyl group.

Stamp depicts Georgius Agricola (1494-1555), who is perhaps best known as the "father of minerology" and for his work De re metallica [On the Nature of Metals].

On March 7, 1955, France issued a set of six stamps under the theme "Famous Inventors." One of these stamps featured Sainte-Claire Deville who created metallic aluminum in 1855. Stamp depicts modern uses of aluminum…

Philatelic First Day Cover with cachet titled, "Atoms for Peace." The cachet depicts a structure called the Atom Smasher, a Van de Graaff electrostatic nuclear accelerator operated by the Westinghouse Electric…

Philatelic First Day Cover with cachet titled, "Atoms for Peace." The cachet includes two photographic images, one portrait of Albert Einstein (1879-1955) and the other of an unknown scientist administering cancer…

Stamp depicts Leo Hendrik Baekeland, a Belgian chemist who invented Bakelite (polyoxybenzylmethylenglycolanhydride) in 1907. Bakelite was an inexpensive, versatile, and popular plastic, which marked the beginning of the…

Stamp depicts aspects of chemistry and related sciences. The design depicting a laboratory vessel is illustrative of the scientific equipment used widely for research in the chemical industry. A representative chemical…

Stamp depicts Albert Einstein and the the equation of mass-energy equivalence (E=MC2). Einstein has been featured on numerous stamps from around the world. His first appearance on a stamp is believed to be on this…

Cachet depicts chemical apparatus used in the petroleum industry. Stamp depicts Paul Sabatier, "founder of catalytic chemistry."

Cachet depicts a bust of Avogadro as well as text of Avogadro's law, which states that equal volumes of gases under the same conditions of temperature and pressure will contain equal numbers of molecules. The stamp…

Depicts Justus von Liebig, known for his work in agricultural and organic chemistry.

French postcard commemorating Louis Jacques Thénard (1777-1857), French chemist and the founder of the Société de Secours des Amis des Sciences.

Depicts Louis Jacques Thénard, French chemist and the founder of the Société de Secours des Amis des Sciences.

A postcard and first day issue cover with a French stamp honoring Louis Jacques Thénard (1777-1857), French chemist and the founder of the Société de Secours des Amis des Sciences.

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…

Set of four postage stamps celebrating the 50th anniversary of Oklahoma's statehood. Depicts an atomic model with an arrow piercing its nucleus overlaying a silhouette of the state of Oklahoma. Reflects Oklahoma’s…

Philatelic First Day Cover commemorating the 100th anniversary of the death of Louis Jacques Thénard (1777-1857), French chemist and the founder of the Société de Secours des Amis des Sciences.

Cachet and stamp depict Claude-Louis Berthollet. Cachet includes text describing Berthollet's contributions to water purification.

Stamp printed in Belgium shows the Atomium and exposition emblem of the 1958 World's Fair in Brussels.

Philatelic First Day Cover with printed cachet and stamp. Cachet depicts the Atomium monument from the 1958 World's Fair Exhibition in Brussel's Belgium. Designed by engineer André Waterkeyn (1917-2005) and architects…

First Day Cover with printed cachet and stamp. Cachet depicts the Atomium monument from the 1958 World's Fair Exhibition in Brussel's Belgium. Designed by engineer André Waterkeyn (1917-2005) and architects André…

Mexican postage stamp issued to commemorate the 20th anniversary of the nationalization of all petroleum reserves, facilities, and foreign oil companies in Mexico and the establishment of the state-owned petroleum…