Leonhard Euler
Mathematician and physicist, Euler's Formula
A prominent mathematician and physicist, contributions included advancements in calculus, graph theory, and topology. Introduced the concept of a mathematical function. Developed Euler's formula that establishes a profound connection between complex analysis and trigonometry. Published over 800 papers and books, making significant contributions to various fields of mathematics and mechanics. His work laid the groundwork for modern mathematics, influencing future generations of mathematicians and scientists.
Introduced Euler's formula in complex analysis
Developed foundational principles in calculus
Contributed to graph theory and topology
Other People Born on April 15th
Étienne Geoffroy Saint-Hilaire
French biologist and zoologist
Born
April 15th, 1772 253 years ago
Died
June 19th, 1844 181 years ago — 72 years old
A prominent figure in the field of biology, contributions included the development of a theory of morphological unity among animals. Pioneered the study of comparative anatomy and established connections among various species. A founding member of the Société Zoologique de France, significant engagements included work on the classification of organisms and the impact of environment on biological development. Collaborated with notable contemporaries in scientific advancements.
Continue ReadingPercy Shaw
Inventor of the cat's eye
Born
April 15th, 1890 135 years ago
Died
1976 49 years ago — 86 years old
An English businessman developed a reflective road safety device that improved visibility for drivers at night. The device, called the cat's eye, consisted of a pair of reflective lenses mounted in a rubber housing. This invention increased road safety and gained widespread adoption in the UK and beyond. Originally patented in the 1930s, the cat's eye significantly reduced accidents by enhancing lane visibility during low-light conditions. Shaw's company continued to produce cat's eyes for decades.
Continue ReadingRobert W. Gore
Engineer, co-inventor of Gore-Tex
Born
April 15th, 1937 88 years ago
Died
September 17th, 2020 5 years ago — 83 years old
An American engineer and businessman, contributed significantly to materials science. Co-invented Gore-Tex, a waterproof and breathable fabric, in 1969, which revolutionized the outdoor apparel industry. The innovation led to the establishment of W. L. Gore & Associates, a company focused on advanced materials and technology. Under leadership, the company expanded its product offerings and became a major player in various fields, including medical devices and electronics. The work in polymer technology extended beyond textiles to applications in industrial and consumer products.
Continue ReadingGuru Nanak
First Sikh Guru and founder of Sikhism
Born
April 15th, 1469 556 years ago
Died
September 22nd, 1539 486 years ago — 70 years old
Began spiritual teachings in the late 15th century, establishing the principles of Sikhism. Emphasized the importance of one God, equality of all people, and community service. Travelled extensively across South Asia to spread messages of love and compassion. Compiled hymns and teachings that were later included in the Guru Granth Sahib, the holy scripture of Sikhism. Founded the city of Kartarpur, which became an important center for Sikh worship.
Continue ReadingCorrie ten Boom
Nazi resister and author of The Hiding Place
Born
April 15th, 1892 133 years ago
Died
1983 42 years ago — 91 years old
Born in the Netherlands, played a pivotal role in sheltering Jewish refugees during World War II. Operated a secret room in her family's home to hide individuals from Nazi persecution. After her arrest, endured imprisonment in concentration camps. Following the war, authored The Hiding Place, detailing experiences and themes of forgiveness and faith. Became a sought-after speaker, sharing lessons of resilience and compassion throughout the world.
Continue ReadingIda Freund
Chemist and educator with teaching roles
Born
April 15th, 1863 162 years ago
Died
May 15th, 1914 111 years ago — 51 years old
Born in Austria, a chemist and educator contributed significantly to the field of chemistry and science education. Freund played a pivotal role in developing practical chemistry curricula. She worked as a teacher at various institutions, emphasizing the importance of hands-on laboratory experiences for students. Her efforts aimed to enhance the understanding of chemistry among future generations. Freund also engaged in scientific research and published several articles that furthered educational methodologies in the sciences. Freund's career reflected a commitment to advancing chemistry education during a time when women faced numerous barriers in the academic field.
Continue ReadingOther People Who Died on September 18th
Olaf Gulbransson
Norwegian painter and illustrator
Born
May 26th, 1873 152 years ago
Died
September 18th, 1958 67 years ago — 85 years old
Born in Norway in 1873, this painter and illustrator gained prominence for contributions to the realms of art and illustration. His artistic journey included studying at the Royal Academy in Munich, leading to a signature style characterized by vivid colors and intricate details. The artist's work appeared in various magazines, showcasing a blend of humor and social commentary. In addition to illustrations, significant involvement in exhibitions further established his reputation during the early 20th century.
Continue ReadingEduardo Bonvallet
Chilean footballer and manager
Born
1955 70 years ago
Died
September 18th, 2015 10 years ago — 60 years old
Played as a midfielder for clubs such as Universidad de Chile and Santiago Wanderers. Transitioned to management after retirement, leading teams in the Chilean league. Contributed to football commentary and analysis in media, sharing insights on the sport and player performances. Had a significant influence on coaching methodologies in Chilean football, focusing on player development.
Continue ReadingStanisław Ignacy Witkiewicz
Polish author and painter
Born
February 24th, 1885 140 years ago
Died
September 18th, 1939 86 years ago — 54 years old
An author, poet, and painter, contributed significantly to the development of Polish theatre and literature in the early 20th century. Established a unique style characterized by the integration of visual arts and dramatic literature. Developed a psychological and philosophical system, particularly through his plays which explored themes of existentialism and identity. Active in the avant-garde movement, Witkiewicz's work often challenged societal norms and traditional artistic expressions. His artistic contributions are marked by a deep engagement with complex human emotions and the absurdities of life.
Continue ReadingMauricio Kagel
Composer and scholar of contemporary music
Born
December 24th, 1931 94 years ago
Died
September 18th, 2008 17 years ago — 76 years old
Born in Argentina and later moving to Germany, this composer contributed significantly to the avant-garde music scene. He studied musicology, performance, and composition, blending elements of theater and music in innovative ways. Some compositions incorporated multimedia elements, exploring the relationship between sound and visual art. This composer was a professor at various institutions, influencing future generations of musicians and composers. Notable works include 'Zwei Augen' and 'Transición,' showcasing a unique approach to contemporary classical music.
Continue ReadingF. H. Bradley
English philosopher and author
Born
1846 179 years ago
Died
September 18th, 1924 101 years ago — 78 years old
A prominent figure in British idealism, contributed significantly to metaphysical thought. Authored works such as 'Appearance and Reality', which explored the nature of reality and perception. Engaged with the ideas of G.W.F. Hegel and emphasized the interconnection of experience and existence. Held the position of Professor of Logic and Metaphysics at the University of Aberystwyth, impacting philosophical discussions for decades.
Continue ReadingBenjamin Kennicott
Theologian and biblical scholar
Born
April 4th, 1718 307 years ago
Died
September 18th, 1783 242 years ago — 65 years old
Born in England in 1718, a prominent theologian and biblical scholar dedicated to textual criticism. The meticulous examination of manuscripts and key biblical texts led to significant contributions in the field of theology. Served as a fellow at Exeter College, Oxford, where scholarly pursuits flourished. Engaged deeply with Hebrew studies and published critical works that highlighted textual variants in the Old Testament, establishing a foundation for future scholars in theology. His efforts in the development of biblical scholarship paved the way for greater understanding of biblical texts among academics and theologians.
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