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Harald Sack

mathematics
Siméon Denis Poisson’s Contributions to Mathematics

Siméon Denis Poisson’s Contributions to Mathematics

Harald Sack
On June 21, 1781, French mathematician, geometer, and physicist Siméon Denis Poisson was born. He is known known for his work on definite integrals, advances in Fourier series, electromagnetic theory, and probability, esp. the eponymous Poisson series, the Poisson integral and the Poisson equation from potential theory. His works also included applications to electricity and magnetism, and astronomy. Simeon Denis Poisson – The Youth of a Mathematician Poisson was born in Pithiviers, Loiret,…
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psychology
James Braid – Gentleman Scientist and Hypnotist

James Braid – Gentleman Scientist and Hypnotist

Harald Sack
On June 19, 1795, Scottish surgeon and “gentleman scientist” James Braid was born. Braid was a significant innovator in the treatment of club-foot and an important and influential pioneer of hypnotism and hypnotherapy. He is regarded by many as the first genuine “hypnotherapist” and the “Father of Modern Hypnotism“. James Braid – Early Years Braid was born the third son, and the seventh and youngest child, of James Braid and Anne Suttie,…
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physics
Sir William Crookes and the Fundamentals of Luminescence

Sir William Crookes and the Fundamentals of Luminescence

Harald Sack
On June 17, 1832, British physicist, chemist, science journalist, and parapsychologist Sir William Crookes was born. Crookes visualized cathode rays, discovered the fundamentals of luminescence and isotopes, and developed methods for detecting ionizing radiation. He discovered the chemical element thallium and the thorium isotope 234Th. William Crookes – Biographical Background William Crookes was born in London, the eldest son of the second wife of Joseph Crookes, a very wealthy tailor. He attended…
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engineering
Henry Ford and the Ford Motor Company

Henry Ford and the Ford Motor Company

Harald Sack
On June 16, 1903, American entrepreneur Henry Ford founded the Ford Motor Company with $28,000 capital. It was not Henry Ford’s first attempt to build up a car company. In 1901 already he founded the Henri Ford Company, which became the Cadillac Motor Company on August 22, 1902, after Ford left with the rights to his name. Henry Ford was 39 years old when he founded the Ford Motor Company, which would go…
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computer science
Herbert A. Simon and the Science of Decision Making

Herbert A. Simon and the Science of Decision Making

Harald Sack
On June 15, 1916, American political scientist, economist, sociologist, psychologist, and computer scientist Herbert Alexander Simon was born. Simon was among the founding fathers of several of today’s important scientific domains, including artificial intelligence, information processing, decision-making, problem-solving, organization theory, complex systems, and computer simulation of scientific discovery. With almost a thousand highly cited publications, he was one of the most influential social scientists of the 20th century. “(If) there were no…
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mathematics
Andrey Markov and the Markov Chains

Andrey Markov and the Markov Chains

Harald Sack
On June 14, 1856, Russian mathematician Andrey (Andrei) Andreyevich Markov was born. He is best known for his work on stochastic processes. A primary subject of his research later became known as Markov chains and Markov processes, i.e. sequences of random variables in which the future variable is determined by the present variable but is independent of the way in which the present state arose from its predecessors. Markov Chains I guess, as…
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literature
William Butler Yeats and Modern English Literature

William Butler Yeats and Modern English Literature

Harald Sack
On June 13, 1865, Irish poet William Butler Yeats was born. Yeats was a driving force behind the Irish Literary Revival and has become one of the foremost figures of 20th century literature. In 1923 he was awarded the Nobel Prize in Literature. “Words are always getting conventionalized to some secondary meaning. It is one of the works of poetry to take the truants in custody and bring them back to their…
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mathematics
Abu al-Wafa Buzjani – Negative Numbers and Trigonometry

Abu al-Wafa Buzjani – Negative Numbers and Trigonometry

Harald Sack
On June 10, 940, Persian mathematician and astronomer Abū al-Wafāʾ, Muḥammad ibn Muḥammad ibn Yaḥyā ibn Ismāʿīl ibn al-ʿAbbās al-Būzjānī was born. Abu l-Wafa wrote several books on applied mathematics, made several important trigonometric discoveries, and wrote now-lost commentaries on the works of Euclid, Diophantus of Alexandria, and al-Chwarizmi. His work on arithmetics for businessmen contains the first instance of using negative numbers in a medieval Islamic text. Abu al-Wafa – Biographical Background…
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engineering
John Smeaton – the Father of Civil Engineering

John Smeaton – the Father of Civil Engineering

Harald Sack
On June 8, 1729, English civil engineer John Smeaton was born. Smeaton actually is referred to having coined the term “civil engineering” to distinguish from military engineers. He was esponsible for the design of bridges, canals, harbours and lighthouses. He was also a capable mechanical engineer and an eminent physicist. John Smeaton’s Way to Civil Engineering John Smeaton was born at Austhorpe Lodge in the parish of Whitkirk, four miles east of…
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anthropology
Knud Rasmussen – the Father of Eskimonology

Knud Rasmussen – the Father of Eskimonology

Harald Sack
On June 7, 1879, Danish polar explorer and anthropologist Knud Johan Victor Rasmussen was born. He has been called the “father of Eskimology” and was the first European to cross the Northwest Passage by dog sled. He remains well known in Greenland, Denmark and among Canadian Inuit. Knud Rasmussen – Early Life Rasmussen was born in Ilulissat, Greenland, as one of three children of a Danish missionary, the vicar Christian Rasmussen, who had been…
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