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physics
Pieter Zeeman and the Zeeman Effect

Pieter Zeeman and the Zeeman Effect

Tabea Tietz
On October 9, 1943, Dutch physicist Pieter Zeeman passed away. Zeeman shared the 1902 Nobel Prize in Physics with Hendrik Lorentz for his discovery of the Zeeman effect, the effect of splitting a spectral line into several components in the presence of a static magnetic field. Youth and Education Pieter Zeeman was born on 25 May 1865 in Zonnemaire, a small town on the island of Schouwen-Duiveland, Netherlands, to Catharinus Forandinus Zeeman, a minister of…
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chemistry
Henry Louis Le Châtelier and the Le Châtelier Principle

Henry Louis Le Châtelier and the Le Châtelier Principle

Harald Sack
On October 8, 1850, French chemist Henry Louis Le Chatelier was born. Le Châtelier is most famous for devising Le Chatelier’s principle, with the help of his partner Jasper Rossi, used by chemists to predict the effect a changing condition has on a system in chemical equilibrium. Youth and Education Le Châtelier was born in Paris, France, the first of six children [1] of French materials engineer Louis Le Chatelier, an influential figure…
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psychology
Emil Kraepelin’s classification system for Mental Illness

Emil Kraepelin’s classification system for Mental Illness

Tabea Tietz
On October 7, 1926, German psychologist Emil Kraepelin passed away. Kraepelin is considered the founder of modern scientific psychiatry, psychopharmacology and psychiatric genetics. He developed a classification system for mental illness that influenced subsequent classifications. Kraepelin made distinctions between schizophrenia and manic-depressive psychosis that remain valid today. “The patients often try to starve themselves, to hang themselves, to cut their arteries; they beg that they may be burned, buried alive, driven out into the…
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chemistry
Florence Seibert and the Tuberculosis Test

Florence Seibert and the Tuberculosis Test

Harald Sack
On October 6, 1897, American biochemist Florence Barbara Seibert was born. Seibert is best known for identifying the active agent in the antigen tuberculin as a protein, and subsequently for isolating a pure form of tuberculin, purified protein derivative (PPD), enabling the development and use of a reliable TB test. Youth and Education Seibert was born in Easton, Pennsylvania, USA, the second of three children of George Peter Seibert, a rug manufacturer…
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economics
Reinhard Selten – Game Theory and Experimental Economics

Reinhard Selten – Game Theory and Experimental Economics

Tabea Tietz
On October 5, 1930, German economist and Nobel Laureate Reinhard Selten was born. Selten is well known for his work in bounded rationality and can be considered as one of the founding fathers of experimental economics. For his work in game theory, Selten won the 1994 Nobel Memorial Prize in Economic Sciences (shared with John Harsanyi and John Nash). “I was always skeptical about authority, about things which were told by authorities, because I…
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biology
Edward Murray East and the Hybrid Corn

Edward Murray East and the Hybrid Corn

Harald Sack
On October 4, 1879, American plant geneticist, botanist, agronomist and eugenisist Edward Murray East was born. East is known for his experiments that led to the development of hybrid corn and his support of ‘forced’ elimination of the ‘unfit’ based on eugenic findings. “Genetics has enticed a great many explorers during the past two decades. They have labored with fruit-flies and guinea-pigs, with sweet peas and corn, with thousands of animals and…
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engineering
Elias Howe and the Invention of the Sewing Machine

Elias Howe and the Invention of the Sewing Machine

Tabea Tietz
On October 3, 1867, American inventor Elias Howe Jr. passed away. Howe is best known for his invention of a a sewing machine using a lockstitch design. Elias Howe – Family Background Elias Howe Jr. was born in Spencer, Massachussetts, USA, the son of Dr. Elias Howe Sr. and Polly (Bemis) Howe. He was apprentice in a textile factory and after mill closings due to the Panic of 1837, he moved to Cambridge, Massachusetts. There, Howe…
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chemistry
Alexander Todd and the Chemistry of Nucleotide Coenzymes

Alexander Todd and the Chemistry of Nucleotide Coenzymes

Harald Sack
On October 2, 1907, British chemist and Nobel laureate Alexander Robertus Todd, Baron Todd was born. Todd‘s research on the structure and synthesis of nucleotides, nucleosides, and nucleotide coenzymes gained him the Nobel Prize for Chemistry. Youth and Education Alexander R. Todd was born near Glasgow, Scotland, the elder son of Alexander Todd, a business man of that city, and his wife Jean Lowrie. In 1918 Todd gained admission to the Allan…
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medical science
Walter Bradford Cannon and the Concept of Homeostasis

Walter Bradford Cannon and the Concept of Homeostasis

Tabea Tietz
On October 1, 1871, American physiologist Walter Bradford Cannon was born. Cannon coined the term fight or flight response, and he expanded on Claude Bernard’s concept of homeostasis. Homeostasis is the property of a system within an animal in which a variable, such as the concentration of a substance in solution, is actively regulated to remain very nearly constant. Examples of homeostasis include the regulation of body temperature, the pH of extracellular fluid, or…
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