Tired of attention and noise, Einstein stuck his tongue out in response - and at that moment the shutter clicked. This is how one of the most famous photos of the 20th century was born.

This photo destroyed the stereotype of geniuses as dry, serious people. Einstein on it is lively, ironic, free. The photo quickly became a symbol of nonconformity, freedom of thought, and intellectual rebellion. It entered t-shirts, posters, and even pop culture - long before the advent of internet memes.

Einstein himself liked the photograph. He even ordered nine copies and signed one for his friend with the words: "I like you because this is the only photo where I look like a human."