Just a simple smile :)

A black and white still from a 1975 quantum mechanics lecture by Paul A. M. Dirac, showing him speaking into a microphone with a chalkboard behind him. The text 'this' is overlaid on the left side of his torso, and 'by Paul A. M. Dirac' is at the bottom. The top text reads 'Quantum Mechanics Lecture (1975)' with an Instagram logo and '@ODTU.FIZIK.TOPLULUGU' watermark.

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