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Was sticking out his tongue a common facial expression from Einstein or a rare capture?

This is one of the most famous photographs in history, known as "Einstein Sticking Out His Tongue." It's a black and white portrait shot in 1951 showing an elderly man with distinctive wild, wispy white hair. He's wearing what appears to be a formal jacket and tie. The most striking feature of the image is his playful, irreverent expression - he's sticking out his tongue directly at the camera while his eyes are wide open, creating a humorous and memorable contrast to his otherwise distinguished appearance. The photograph has become an iconic symbol of breaking conventional expectations and maintaining a sense of humor and playfulness regardless of one's status or age. The image has strong contrast and clarity typical of professional photography from that era, with the dark background helping to emphasize the subject's expressive face and distinctive hair.