The 2019 Mazurian Lakes Conference on Physics was held in Piaski, a vacation resort located at the lake of Bełdany in the heart of the Great Mazurian Lakes District, from the 1 st to 7 th of September 2019. It was the 36 th meeting in a series initiated over 50 years ago, in 1968, by Professor Zdzisław Wilhelmi and his students and collaborators. Throughout these years, the Mazurian conferences have gained a worldwide reputation for their high scientific merit and a unique atmosphere. The 36 th meeting