The problem of an inconsistent description of an “interface” between the A/D converter and the digital signal processor that implements, for example, a digital filtering (described by a difference equation) – when a sequence of some hypothetical weighted Dirac deltas occurs at its input, instead of a sequence of numbers – is addressed in this paper. Digital signal processors work on numbers, and there is no “interface” element that converts Dirac deltas into numbers. The output of the A/D converter is directly connected to the input of the signal processor. Hence, a clear conclusion must follow that sampling devices do not generate Dirac deltas. Not the other way around. Furthermore, this fact has far-reaching implications in the spectral analysis of discrete signals, as discussed in other works referred to in this paper.

The major part of the paper is describing practice of using oral history method in the “Grodzka Gate – NN Theater” Center in Lublin. This cultural center started collecting testimonies in 1995 and formally created the Oral History Program in 1998. Educational and artistic exemplars include most of activities there: using oral history as a background in exhibitions, artistic celebrations and long-term programs, commemorations (about Righteous Among the Nations, Holocaust Survivors etc.).

The contemporary science has become more and more parameterized and focused on points. In this situation it is more and more difficult to maintain “the purity” of the idea of science and its main goal – discovering the world, in selfless duty. That’s the reason why I have presented the example of a scientist, who was uncompromisingly, and with a real passion, devoted to science. I have choosen Maria Skłodowska-Curie: we celebrate the 150th anniversary of her birth in 2017.