Ernst Mach, an influential physicist and philosopher, was born in Brno, Czech Republic, in 1838. Known for his groundbreaking work in the field of psychophysics, Mach made significant contributions to our understanding of the human perception of sensation and the speeds of objects in motion. His famous "Mach number" in fluid dynamics is still widely used today. Mach's philosophies also played a crucial role in the development of logical positivism, which emphasized the importance of empirical evidence in scientific theories. His work continues to inspire scientists and philosophers alike, making him a remarkable figure in the history of science. Explore more about Ernst Mach's contributions and legacy.