Doc. Ing. Lukáč Halčák, CSc. (1938-2023) was a tutor and supporter of several of us in the very beginnings of our scientific career. He introduced us to the topic of oxidative stress, taught us how to measure its markers, and started research that resulted in publications (1, 2, 3), theses and scientific degrees of our students. Also on their behalf, associate professor, thank you…