In April 2022, a celebration was held at the Adam Mickiewicz University in Poznań in honour of Prof. Jerzy Danielewicz, a brilliant Hellenist of international renown and one of the most prolific translators of Greek literature into Polish, on the golden jubilee of his doctorate. An account of this event is followed by the speech Prof. Danielewicz delivered on that occasion, in which he points to his place in the community of Classicists in Poznań across time.

The paper presents theoretical analysis and simulation results of the process of regular surface texture generation by grinding with the wheel shaped in a special way. Simple variant of the method consists in grinding with the wheel having single helical groove. Non-uniform load of abrasive grains located in different zones of the wheel circumference was described. Two models (deterministic and probabilistic) of the wheel active surface were developed, assuming different grain arrangement. Results of two models were compared and differences were explained.

Professor Piotr Węgleński, who died on January 19, 2024 studied and worked at the University of Warsaw – at the Faculty of Biology and later at the Center for New Technologies. He was a member of the Polish Academy of Sciences and the vice-rector and later the rector of the University of Warsaw. He was responsible for introducing genetic engineering to Poland. He was a great boss – that is what we always called him – and a great academic teacher and was very active in popularizing science.

Phosphogypsum (PG) – a waste material generated in enormous amounts, accumulates a wide range of pollutants and thus represents a major environmental problem. Among the proposed potential strategies for PG management, none has been implemented on a large scale up to date. At the same time, the rapid depletion of phosphorite resources, used to manufacture most commercial phosphorus (P) fertilizers, poses unprecedented challenges for future agriculture and environmental protection. The aim of this study was to assess the possibility of using PG as a source of P for fertilizing plants. The effect of PG fertilization on the dry mass accumulation, P and sulphur (S) contents in soil and in the above-ground parts of plants, as well as on the level of heavy metal contaminations, were studied in the experimental model consisted of 12 genotypes of three lupine species – Lupinus angustifolius, Lupinus albus and Lupinus luteus. The PG application increased the content of both the available and active P in the soil. The increased P bioavailability resulted in an elevated uptake and intracellular content of this nutrient in the studied plant species in a dose- and variety-dependent manner. The heavy metals present in the waste did not affect their accumulation in the plants. The results indicate the possibility of using P forms present in PG as an alternative source of this component in plant nutrition, at the same time allowing elimination of the waste deposited on huge areas, which will certainly contribute to improving the quality of the environment.