Do you recognise the two Nobel Prize awarded physicists? These photos were taken when physicists Paul Dirac and Richard Feynman attended the international scientific conference on General Relativity and Gravitation in July 1962 in Poland. Here they are seen in deep conversation – presumably about quantum physics. It is said that Feynman idolised Dirac and saw him as one of his heroes. Dirac was awarded the physics prize in 1933 for formulating a fully relativistic quantum theory. The equation gave solutions that he interpreted as being caused by a particle equivalent to the electron, but with a positive charge. This particle, the positron, was later confirmed through experiments. Fifteen years later (1948), in particular, Richard Feynman contributed to creating a new quantum electrodynamics by introducing Feynman diagrams: graphic representations of various interactions between different particles. These diagrams facilitate the calculation of interaction probabilities. Feynman received the physics prize in 1965. Photo credits: 1) Caltech 2) Marek Holzman, CC BY 4.0 via Wikimedia Commons