Image: https://cdn.whensthebirthday.com/gallery/2017/1/ernst-mach/ernst-mach-creationwiki-la-enciclopedia-de.jpg
Ernst Mach
professions.scientist de Austria
Image: https://cdn.whensthebirthday.com/gallery/2017/1/ernst-mach/ernst-mach-creationwiki-la-enciclopedia-de.jpg
professions.scientist de Austria