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Tabea Tietz

astronomy
Jean Picard and his Love for Accuracy

Jean Picard and his Love for Accuracy

Tabea Tietz
On July 21, 1620, French astronomer, cartographer and hydraulic engineer Jean-Félix Picard was born. He is regarded as the founder of modern astronomy in France. He introduced new methods, improved the old instruments, and added new devices, such as Huygens‘ pendulum clock to record times and time intervals. Background Jean Picard Jean-Félix Picard was born as a son of a bookseller and was allowed to study at the Jesuit Collège Royal Henry-Le-Grand, which…
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art
The Dancers of Edgar Degas

The Dancers of Edgar Degas

Tabea Tietz
On July 19, 1834, French artist Edgar Degas was born, famous for his paintings, sculptures, prints, and drawings. He is especially identified with the subject of dance; more than half of his works depict dancers. He is regarded as one of the founders of Impressionism, although he rejected the term, and preferred to be called a realist. “An artist is a deception.. ..an artist is only an artist at certain times, by…
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art
The World of Lyonel Feininger

The World of Lyonel Feininger

Tabea Tietz
On July 17, 1871, German-American painter Lyonel Charles Feininger was born. He became a leading exponent of Expressionism and especially Cubism. Lyonel Feininger Background Lyonel Feininger was born into a family of musicians. His father was the famous German violinist and composer Karl Feininger and his mother, Elizabeth Feininger was an American pianist and singer. Feininger himself visited Germany for the first time at the age of 16, when his parents gave several…
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economics
Vilfredo Pareto and the Law of the Vital Few

Vilfredo Pareto and the Law of the Vital Few

Tabea Tietz
On July 15, 1848, Italian engineer, sociologist, economist, political scientist and philosopher Vilfredo Federico Damaso Pareto was born. He made several important contributions to economics, particularly in the study of income distribution and in the analysis of individuals’ choices. The Pareto principle was named after him and built on observations of his such as that 80% of the land in Italy was owned by 20% of the population. “The assertion that men are…
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chemistry
August Kekulé and the Carbon Ring Structure

August Kekulé and the Carbon Ring Structure

Tabea Tietz
On July 13, 1896, German organic chemist Friedrich August Kekulé passed away. Being one of the world’s leading chemists of his time, he is best known for devising the ring structure of carbon atoms in organic molecules and became the principal founder of the theory of chemical structure. August Kekulé Background August Kekulé was born on September 7, 1829 in Darmstadt as son of a civil servant. After graduating from secondary school, in 1847…
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physics
John Wheeler and the Golden Age of General Relativity

John Wheeler and the Golden Age of General Relativity

Tabea Tietz
On July 9, 1911, American theoretical physicist John Archibald Wheeler was born. Wheeler worked with Niels Bohr in explaining the basic principles behind nuclear fission as well as with Albert Einstein, with whom he tried to achieve Einstein’s vision of a unified field theory. He is also known for popularizing the term black hole, and for coining the terms quantum foam, and wormhole. Background John Wheeler John Archibald Wheeler grew up in a Unitarian…
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aviation
Count Ferdinand von Zeppelin and his Rigid Dirigible Airships

Count Ferdinand von Zeppelin and his Rigid Dirigible Airships

Tabea Tietz
On July 8, 1838, German aviation pioneer Count Ferdinand von Zeppelin was born. After retiring from his military carreer, he built the first rigid dirigible airships, named Zeppelin, and founded the Zeppelin airship company. Ferdinand von Zeppelin – Early Years Count Ferdinand von Zeppelin was born on the Dominican Island in Constance in what is now the Inselhotel. He was the son of Count Friedrich Jerôme Wilhelm Karl von Zeppelin (1807-1886), the former…
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archeology
A. E. Douglass and the Dendrochronology

A. E. Douglass and the Dendrochronology

Tabea Tietz
On July 5, 1867, American astronomer and archeologist A. E. (Andrew Ellicott) Douglass was born. He coined the name dendrochronology for tree-ring dating, a field he originated while working at the Lowell Observatory, Flagstaff, Arizona, by his discovery a correlation between tree rings and the sunspot cycle. A. E. Douglass Background A. E. Douglass was not the first, who suggested that a tree’s rings could determine its age. The first known record of…
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physics
Hans Bethe and the Energy of the Stars

Hans Bethe and the Energy of the Stars

Tabea Tietz
On July 2, 1906, German and American nuclear physicist and Nobel Laureate Hans Albrecht Bethe was born. Bethe helped to shape classical physics into quantum physics and increased the understanding of the atomic processes responsible for the properties of matter and of the forces governing the structures of atomic nuclei. Hans Bethe Background Hans Bethe entered the University of Frankfurt in 1924, majoring in chemistry. However, after a few semesters, he was advised…
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medical science
Ignaz Semmelweis and the Importance of Washing Your Hands as a Doctor

Ignaz Semmelweis and the Importance of Washing Your Hands as a Doctor

Tabea Tietz
On July 1, 1818, Hungarian physician of German extraction Ignaz Semmelweis was born. He is best known for his discovery of the cause of puerperal (“child bed”) fever and introduced antisepsis into medical practice by insisting on health workers rigorously handwashing between patients, and clean bed sheets. Ignaz Semmelweis – Youth and Education Ignaz Semmelweis was born in 1818 in the Tabán sub-district of Buda, Hungary,  in 1818 as the 5th child of the…
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