A teacher uses a machine which employs both fingerprint and facial recognition technology to check the identification of a student before a simulated college entrance exam in Handan in China's northern Hebei province on June 6, 2017. The simulated exam was held to familiarise students with the process to be used for annual college entrance exams which begin nationwide on June 7. Millions of students across China will take the exams. / AFP PHOTO / STR / China OUT (Photo credit should read STR/AFP/Getty Images)
