Image: https://cdn.whensthebirthday.com/gallery/2017/1/ernst-mach/archivo-mach-ernst-1905-jpg-wikipedia-el.jpg
Ernst Mach
professions.scientist de Austria
Image: https://cdn.whensthebirthday.com/gallery/2017/1/ernst-mach/archivo-mach-ernst-1905-jpg-wikipedia-el.jpg
professions.scientist de Austria