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physics
Statistical Mechanics with Paul Ehrenfest

Statistical Mechanics with Paul Ehrenfest

Harald Sack
On January 18, 1881, Austrian and Dutch theoretical physicist Paul Ehrenfest was born. Ehrenfest made major contributions to the field of statistical mechanics and its relations with quantum mechanics, including the theory of phase transition and the Ehrenfest theorem. “Einstein, my upset stomach hates your theory — it almost hates you yourself ! How am I to provide for my students ? What am I to answer to the philosophers ?” –…
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astronomy
The Universe goes beyond the Milky Way – thanks to Edwin Hubble

The Universe goes beyond the Milky Way – thanks to Edwin Hubble

Tabea Tietz
On November 20, 1889, American astronomer Edwin Hubble was born. He is best known for his role in establishing the field of extragalactic astronomy and is generally regarded as one of the most important observational cosmologists of the 20th century. “Equipped with his five senses, man explores the universe around him and calls the adventure Science.” – Edwin Hubble (1929) Edwin Hubble – Early Years Although Edwin Hubble earned pretty good grades in…
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chemistry
Maria Skłodowska Curie – Truly an Extraordinary Woman

Maria Skłodowska Curie – Truly an Extraordinary Woman

Tabea Tietz
On November 7, 1867, Marie Curie was born, French-Polish physicist, chemist, pioneer in research of radioactivity.  She was the first woman to win a Nobel Prize, is the only woman to win the Nobel prize twice, and is the only person to win the Nobel Prize in two different scientific fields. “One never notices what has been done; one can only see what remains to be done.” — Marie Curie, Letter to her…
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physics
Niels Bohr and the Origins of Quantum Mechanics

Niels Bohr and the Origins of Quantum Mechanics

Tabea Tietz
On October 7, 1885, Danish physicist and Nobel Laureate Niels Bohr was born. Bohr made foundational contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922. “Physics is to be regarded not so much as the study of something a priori given, but rather as the development of methods of ordering and surveying human experience. In this respect our task must be to account…
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physics
Now I am become Death, the Destroyer of Worlds – The Trinity Test

Now I am become Death, the Destroyer of Worlds – The Trinity Test

Harald Sack
On July 16, 1945, the first detonation of a nuclear device with the code name Trinity took place in the Jornada del Muerto desert in New Mexico. Although nuclear chain reactions had been hypothesized already in 1933 and the first artificial self-sustaining nuclear chain reaction (Chicago Pile-1) had taken place in December 1942, the date of the Trinity test is usually considered to be the beginning of the Atomic Age. Los Alamos director…
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physics
Georges Lemaître and the Origins of the Big Bang Theory

Georges Lemaître and the Origins of the Big Bang Theory

Harald Sack
On June 20, 1966, Belgian priest, astronomer and professor of physics Georges Lemaître passed away. He was the first person to propose the theory of the expansion of the Universe, widely misattributed to Edwin Hubble, and is best known for his proposal of what became known as the Big Bang theory of the origin of the Universe. “We want a fireworks theory of evolution. The last two thousand million years are slow…
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physics
Theodore Maiman and the Invention of the Laser

Theodore Maiman and the Invention of the Laser

Tabea Tietz
On May 16, 1960, American physicist Theodore Maiman presents the world’s first operating laser at Hughes Research Laboratories, Malibu, California. Today, lasers are present everywhere, ranging from common consumer devices such as DVD players, laser printers, and barcode scanners to professional laser devices for surgery and various other skin treatments, or in industry for cutting and welding materials. Actually, it was Albert Einstein, who has laid the theoretical foundations for the laser in his…
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physics
Heike Kamerlingh Onnes and Superconductivity

Heike Kamerlingh Onnes and Superconductivity

Tabea Tietz
On April 8, 1911, Dutch physicist and Nobel Laureate Heike Kamerlingh Onnes found that at a temperature of only 4.2 K (-269° C) the resistance in a solid mercury wire immersed in liquid helium suddenly vanished. Kamerlingh Onnes discovered superconductivity. „Door meten tot weten“ – “Through measurement to knowledge” – Motto of Kamerlingh Onnes’ Laboratory Early Years Born in Groningen, Netherlands, Kamerlingh Onnes also attended the city’s university and studied under the famous…
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art
Franz Marc – German Expressionism and Der blaue Reiter

Franz Marc – German Expressionism and Der blaue Reiter

Harald Sack
On February 8, 1880, German painter and printmaker Franz Marc was born. Franz Marc is one of the key figures of German Expressionism. He was a founding member of Der Blaue Reiter (The Blue Rider), a journal whose name later became synonymous with the circle of artists collaborating in it. “Art is nothing but the expression of our dream; the more we surrender to it the closer we get to the inner…
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astronomy
Urbain Le Verrier and the hypothetical Planet Vulcan

Urbain Le Verrier and the hypothetical Planet Vulcan

Tabea Tietz
On 2 January 1860, French astronomer Urbain Le Verrier announced the discovery of Vulcan, a hypothetical planet inside the Mercury orbit, to a meeting of the Académie des Sciences in Paris. Despite the lack of any reliable observation, Le Verrier really was convinced until his death that he had discovered a new planet. It was Einstein’s special theory of relativity and a completely new understanding of the laws of gravity that modified the predicted…
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