The most iconic photo of Nobel Prize winner Albert Einstein was taken on his 72nd birthday, on March 14, 1951. Apparently, like many of us, the theoretical physicist was tired of having to smile in photos. When he was asked to smile for the camera, instead he decided to stick out his tongue.
The photo was taken by photographer Arthur Sasse, and became the most recognizable photo of the physicist. Evidently, Einstein loved the photo as well, and ordered nine copies of it for himself. Over time, the photo was become a commercial success used in merchandise depicting the great scientist and other pop culture artifacts.