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Harald Sack

biology
Hans Christian Gram and the Gram Stain

Hans Christian Gram and the Gram Stain

Harald Sack
On September 13, 1853, Danish bacteriologist Hans Christian Gram was born. Gram is best known for his development of the Gram stain, which differentiates bacteria by the chemical and physical properties of their cell walls by detecting peptidoglycan, which is present in a thick layer in gram-positive bacteria. Hans Christian Gram – Youth and Education Hans Christian Gram was the son of Frederik Terkel Julius Gram, a professor of jurisprudence, and Louise Christiane Roulund. In 1871,…
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medical science
Thomas Sydenham – the English Hipocrates

Thomas Sydenham – the English Hipocrates

Harald Sack
On September 10, 1624, English physician Thomas Sydenham was born. He was the author of Observationes Medicae which became a standard textbook of medicine for two centuries so that he became known as ‘The English Hippocrates’. Among his many achievements was the discovery of a disease, Sydenham’s Chorea, also known as St Vitus Dance. Thomas Sydenham’s struggles with the medical degree Thomas Sydenham was born at Wynford Eagle in Dorset, the son…
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art
Pieter Brueghel the Elder and the Dutch Golden Age of Painting

Pieter Brueghel the Elder and the Dutch Golden Age of Painting

Harald Sack
On September 9, 1569, Flemish painter Pieter Brueghel the Elder passed away. He was the most significant artist of Dutch and Flemish Renaissance painting, a painter and printmaker, known for his landscapes and peasant scenes. He is sometimes referred to as “Peasant Bruegel“, to distinguish him from the many later painters in his family, including his son Pieter Brueghel the Younger (1564–1638).[1] Pieter Brueghel the Elder – Background Little is known with…
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biology
Comte de Buffon and his Histoire Naturelle

Comte de Buffon and his Histoire Naturelle

Harald Sack
On September 7, 1707, French naturalist, mathematician, cosmologist, and encyclopedic author Georges-Louis Leclerc, Comte de Buffon was born. Buffon formulated a crude theory of evolution and was the first to suggest that the earth might be older than suggested by the Bible. His works influenced the next two generations of naturalists, including Jean-Baptiste Lamarck [2] and Georges Cuvier.[6] “Truly, Buffon was the father of all thought in natural history in the second half of…
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mathematics
Giovanni Saccheri and his Problems with Euclidian Geometry

Giovanni Saccheri and his Problems with Euclidian Geometry

Harald Sack
On September 5, 1667, Italian Jesuit priest, scholastic philosopher, and mathematician Giovanni Girolamo Saccheri was born. He is primarily known today for his last publication, Euclide Ab Omni Naevo Vindicatus (Euclid Freed of Every Flaw, 1733), now considered the second work in non-Euclidean geometry. First Contact with Euclid’s Elements Saccheri was born in Sanremo to his father Giovanni Felice Saccheri, a lawyer and notary.[6] As a child Saccheri ‘was notably precocious’.[1] He entered the…
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mathematics
James Joseph Sylvester – Lawyer and Mathematician

James Joseph Sylvester – Lawyer and Mathematician

Harald Sack
On September 3, 1815, English mathematician James Joseph Sylvester was born. He made fundamental contributions to matrix theory, invariant theory, number theory, partition theory and combinatorics. He also was the founder of the American Journal of Mathematics. “It seems to be expected of every pilgrim up the slopes of the mathematical Parnassus, that he will at some point or other of his journey sit down and invent a definite integral or two…
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music
Emanuel Schikaneder – The Most Talented Theatre Man of his Era

Emanuel Schikaneder – The Most Talented Theatre Man of his Era

Harald Sack
On September 1, 1751, German impresario, dramatist, actor, singer and composer Emanuel Schikaneder was born. So you have never heard of Schikaneder? Oh, but for sure you have heard of Mozart [1], and Schikaneder wrote the libretto of Wolfgang Amadeus Mozart‘s popular opera The Magic Flute [7]. Moreover, he was often referred to as “one of the most talented theater men of his era” and was the builder of the Theater an der…
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art
Jacques-Louis David’s History Paintings

Jacques-Louis David’s History Paintings

Harald Sack
On August 30, 1748, influential French painter in the Neoclassical style Jacques-Louis David was born. He is considered to be the preeminent painter of the era. In the 1780s his cerebral brand of history painting marked a change in taste away from Rococo frivolity toward a classical austerity and severity. “I want my works to bear the character of antiquity, so much so that, if it were possible for an Athenian to…
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philosophy
John Locke and the Importance of the Social Contract

John Locke and the Importance of the Social Contract

Harald Sack
On August 29, 1632, English philosopher and physician John Locke was born. One of the most influential of Enlightenment thinkers he became known as the “Father of Classical Liberalism“. He spent over 20 years developing the ideas he published in his most significant work, Essay Concerning Human Understanding (1690) which analyzed the nature of human reason, and promoted experimentation as the basis of knowledge. “To love truth for truth’s sake is the…
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geology
Jean-Baptiste Louis Romé de L’Isle and the Beauty of Crystals

Jean-Baptiste Louis Romé de L’Isle and the Beauty of Crystals

Harald Sack
On August 26, 1736, French physicist and mineralogist Jean-Baptiste Louis Romé de L’Isle was born. He is considered as one of the creators of modern crystallography. Driven by Carl Linnaeus‘ classification of living things [1], Romé de L’Isle tried to transfer this to inanimate nature and thus created the first systematics of crystals. Romé de L’Isle – Youth and Travels Jean-Baptiste Louis Romé de L’Isle was born in in Gray, Haute-Saône, in eastern…
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