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psychology
Abraham Maslow and the Hierarchy of Needs

Abraham Maslow and the Hierarchy of Needs

Harald Sack
On April 1, 1908, American psychologist Abraham Harold Maslow was born. He is best known for creating Maslow’s hierarchy of needs, a theory of psychological health predicated on fulfilling innate human needs in priority, culminating in self-actualization. He stressed the importance of focusing on the positive qualities in people, as opposed to treating them as a “bag of symptoms.” “I suppose it is tempting, if the only tool you have is a…
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philosophy
Emanuel Swedenborg Visions of the Afterlife

Emanuel Swedenborg Visions of the Afterlife

Harald Sack
On March 29, 1772, Swedish scientist, philosopher, theologian, and mystic Emanuel Swedenborg passed away. He is best known for his book on the afterlife, Heaven and Hell (1758). From Swedenborg’s inventive and mechanical genius came his method of finding terrestrial longitude by the Moon, new methods of constructing docks and even tentative suggestions for the submarine and the airplane. Swedenborg had a prolific career as an inventor and scientist. In 1741, at…
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mathematics
The Life and Work of Philippe de La Hire

The Life and Work of Philippe de La Hire

Tabea Tietz
On March 18, 1640, French mathematician, astronomer, architect, and key figure in the Académie royale des sciences Philippe de La Hire was born. Educated as an Artist Philippe de La Hire was educated as an artist and became skilled in drawing and painting early. It is believed that de La Hire received no formal education in an official school even though his father was probably teaching him at home. At the age of…
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mathematics
Frank P. Ramsey and the Ramsey Theory

Frank P. Ramsey and the Ramsey Theory

Harald Sack
On February 22, 1903, precocious British philosopher, mathematician and economist Frank Plumpton Ramsey was born. Although he died already at age 26, he had made significant contributions to logic, philosophy of mathematics, philosophy of language and decision theory. He remains noted for his Ramsey Theory, a mathematical study of combinatorial objects in which a certain degree of order must occur as the scale of the object becomes large. “The first problem I…
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astronomy
Johannes Hevelius and his Selenographia

Johannes Hevelius and his Selenographia

Tabea Tietz
On January 28, 1611, German astronomer Johannes Hevelius was born. From four years’ telescopic study of the Moon, using telescopes of long focal power, Hevelius compiled Selenographia (“Pictures of the Moon“, 1647), an atlas of the Moon with some of the earliest detailed maps. Family Background and Early Years Johannes Hevelius‘ father was a succesful merchant and pushed Johannes to follow his footsteps rather than pursue a scientific career. Hevelius was sent to Poland…
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mathematics
A great man whose only fault was being a woman – Émilie du Châtelet

A great man whose only fault was being a woman – Émilie du Châtelet

Harald Sack
On December 17, 1706, French mathematician, physicist, and author Gabrielle Émilie Le Tonnelier de Breteuil, marquise du Châtelet was born. Her major achievement is considered to be her translation and commentary on Isaac Newton‘s work Principia Mathematica, which still is the standard French translation of Newton‘s work today. Philosopher and author Voltaire, one of her lovers, once declared in a letter to his friend King Frederick II of Prussia that du Châtelet…
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mathematics
Leibniz and the Invention of the Integral Calculus

Leibniz and the Invention of the Integral Calculus

Harald Sack
On November 11, 1675, German mathematician and polymath Gottfried Wilhelm Leibniz demonstrates integral calculus for the first time to find the area under the graph of y = ƒ(x). Integral calculus is part of infinitesimal calculus, which in addition also comprises differential calculus. In general, infinitesimal calculus is the part of mathematics concerned with finding tangent lines to curves, areas under curves, minima and maxima, and other geometric and analytic problems. Today, Gottfried Wilhelm Leibniz…
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computer science
GNU’s not Unix – From Operating Systems to Political Activism

GNU’s not Unix – From Operating Systems to Political Activism

Harald Sack
On September 27, 1983, American software freedom activist and computer programmer Richard Stallman announced the GNU project. Its aim is to give computer users freedom and control in their use of their computers and computing devices, by collaboratively developing and providing software. You’ve probably never heard of GNU, unless you are a computer scientist or some kind of software developer. But, GNU denotes the starting point of a development that still continues…
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chemistry
A Life of Discoveries – the great Michael Faraday

A Life of Discoveries – the great Michael Faraday

Tabea Tietz
On September 22, 1791, the famous chemist and physicist Michael Faraday  was born. He is responsible for the discovery of the electromagnetic induction, the laws of electrolysis and best known for his inventions, which laid the foundations to the electrical industry. But, to understand the person and the scientist Michael Faraday, we have to look a little bit into his background and his development. “I was at first almost frightened when I…
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physics
A Wire to Connect the World – Stephen Gray’s Discovery

A Wire to Connect the World – Stephen Gray’s Discovery

Harald Sack
Today for us it’s pretty normal that electricity can be transmitted on a wire, because it’s part of our daily life. But, in the early 18th century, when the English nature-scientist Stephen Gray was able to show that electricity really can be transmitted on a string of copper, it was an unheard-of revelation. Stephen Gray Background Stephen Gray was born in Canterbury, Kent, the son of the dyer Mathias Gray, baptized on…
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