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