Just minutes after Caucher Birkar was given a golden Fields Medal at a ceremony Wednesday in Rio de Janeiro, it vanished.
Birkar, a Kurd who fled Iran and became a Cambridge University professor, was one of four people to win the award.
"I really want to help people in less privileged locations, countries. ... Especially in the case of Kurds," he said in receiving the award. "And I'm hoping that this news would maybe put a little smile on the lips of these 40 million people."