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18 Sep, 1819
11 Feb, 1868
48 years
Multiple sclerosis
French
Male
Foucault was initially trained in medicine but later shifted to physics.
He collaborated with physicist Hippolyte Fizeau on early light-speed measurements, enhancing the understanding of light.
The first Foucault pendulum demonstration took place at the Panthéon in Paris in 1851.
The term "Foucault pendulum" became a popular feature in science museums worldwide, symbolizing the Earth's rotation.

15 Apr, 1707
18 Sep, 1783
76 years
Brain hemorrhage
Swiss
Male
Euler gradually lost his eyesight in his right eye due to a childhood fever, and in 1771 he became completely blind in both eyes. Despite this setback, he continued to work and produce groundbreaking mathematics.
Euler introduced many symbols and notations that are widely used today. He popularized the use of the Greek letter π for representing the ratio of a circle's circumference to its diameter and the letter e for Euler's number.
Euler is often regarded as the founder of graph theory. In 1736, he solved the famous Seven Bridges of Königsberg problem, proving that it was impossible to find a walk crossing each bridge exactly once in the city of Königsberg.
Euler was an incredibly prolific mathematician, producing over 800 books and papers throughout his career. His works spanned various mathematical disciplines and laid the foundations for much of modern mathematic

September 2025: Honoring the Lives and Legacies of Cultural, Creative, and Sporting Icons September 2025 was a month marked by profound loss across the worlds of art, music, film, sport, fashion, science, and public life…