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astronomy
James Edward Keeler and the Rings of Saturn

James Edward Keeler and the Rings of Saturn

Harald Sack
On September 10, 1857, American astronomer James Edward Keeler was born. Keeler is best known for being the astronomer who confirmed James Clerk Maxwell‘s theory that the rings of Saturn were not solid (requiring uniform rotation), but composed of meteoric particles.[3] James Edward Keeler – Early Years James Edward Keeler was born in La Salle, Illinois, to William F. Keeler, who served as a paymaster in the U.S. Navy at the time…
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biology
Augustine Pyramus de Candolle and the Biological Clock

Augustine Pyramus de Candolle and the Biological Clock

Tabea Tietz
On September 9, 1841, Swiss botanist Augustin Pyramus de Candolle passed away. Candolle originated the idea of “Nature’s war”, which influenced Charles Darwin and the principle of natural selection.[3,4] Furthermore, he recognized that multiple species may develop similar characteristics that did not appear in a common evolutionary ancestor; this was later termed analogy. During his work with plants, de Candolle noticed that plant leaf movements follow a near-24-hour cycle in constant light, suggesting that…
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medical science
Paul Gerson Unna and Dermatopathology

Paul Gerson Unna and Dermatopathology

Harald Sack
On September 8, 1850, German dermatologist Paul Gerson Unna was born, who was one of the pioneers in dermatopathology. He became known internationally in his field after writing a book on Histopathology of Skin Diseases (1884), which became a classic work. His name is also remembered for the Unna-Pappenheim stain, the most common stain for blood smears. “Dermatology … this young daughter of medicine.” – Paul Gerson Unna Paul Gerson Unna – Early Years…
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chemistry
Luis Federico Leloir and the Metabolic Pathways of Lactose

Luis Federico Leloir and the Metabolic Pathways of Lactose

Harald Sack
On September 6, 1906, Argentine physicist and biochemist Luis Federico Leloir was born. Leloir received the 1970 Nobel Prize in Chemistry for his discovery of the metabolic pathways in lactose, becoming only the third Argentine to receive the prestigious honor in any field. His research has led to significant progress in understanding, diagnosing and treating the congenital disease galactosemia. “This is only one step in a much larger project. I discovered (no, not…
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astronomy
Victor Ambartsumian and Theoretical Astrophysics

Victor Ambartsumian and Theoretical Astrophysics

Tabea Tietz
On September 5, 1908, Soviet astronomer and astrophysicist Viktor Amazaspovich Ambartsumian was born. Ambartsumian is well known as one of the founders of theoretical astrophysics. He worked in the field of physics of stars and nebulae, stellar astronomy, dynamics of stellar systems and cosmogony of stars and galaxies, and contributed to mathematical physics. Early Years Victor Ambartsumian was the son of the prominent philologist and writer Hamazasp Asaturovich Ambartsumian, the translator of Homer’s Iliad…
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architecture
Urban Planning with Daniel H. Burnham

Urban Planning with Daniel H. Burnham

Harald Sack
On September 4, 1846, American architect and urban designer Daniel Burnham was born. Burnham took a leading role in the creation of master plans for the development of a number of cities, including Chicago, Manila and downtown Washington, D.C. He also designed several famous buildings, including the Flatiron Building of triangular shape in New York City, Union Station in Washington D.C., the Continental Trust Company Building tower skyscraper in Baltimore, and a…
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mathematics
Carl Størmer and the Mathematical Model of the Formation of Aurorae

Carl Størmer and the Mathematical Model of the Formation of Aurorae

Tabea Tietz
On September 3, 1874, Norwegian mathematician and geophysicist Carl Størmer was born. Carl Størmer is known both for his work in number theory and for studying the movement of charged particles in the magnetosphere and the formation of aurorae. He also contributed both important photographic observations and mathematical data to the understanding of the polar aurora, of stratospheric and mesospheric clouds, and of the structure of the ionosphere. The discovery of the Van Allen…
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cinematography
The Third Man – A Film Noir Masterpiece

The Third Man – A Film Noir Masterpiece

Harald Sack
On September 2, 1949, The Third Man, directed by Carol Reed starring Orson Welles and Joseph Cotton, was officially released. Based on a novel by Graham Greene, The Third Man has become an iconic masterpiece that has been voted as the greatest British film of all time by the British Film Institute in 1999. Set in the ruins of post war Vienna it plays with the damaged history of its protagonists, about…
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engineering
Carl Auer von Welsbach enlightened the Streets of Europe

Carl Auer von Welsbach enlightened the Streets of Europe

Tabea Tietz
On September 1, 1858, Austrian inventor Carl Auer von Welsbach was born. Von Welsbach is particularly well known for his work on rare earth elements, which led to the development of the flint used in modern lighters, the gas mantle which brought light to the streets of Europe in the late 19th century, and for the development of the metal filament light bulb. Family, Youth, and Education Carl Auer von Welsbach’s father Alois Auer…
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