Ernst Mach

Born on February 18, 1838, in what is now Brno, Ernst Mach became one of the most influential scientific thinkers of his era. He studied at the University of Vienna and later taught at Graz, Prague, and Vienna, building a reputation for work that crossed physics, physiology, and philosophy.

In physics, he is especially remembered for research on optics, mechanics, and the motion of bodies moving faster than sound. The term Mach number was named in his honor, reflecting his importance in the study of shock waves and high-speed motion.

Mach was also a major voice in the philosophy of science. He argued that science should stay closely tied to experience and observable facts, and his criticism of absolute space and time influenced later thinkers, including Albert Einstein and the development of logical positivism.