A series of interactive lectures at various Faculties of the Silesian University of Technology, during which a mathematician presents how mathematics can be used in a given Faculty, and a scientist from this Faculty tells how it reflects the reality. We want to show you that mathematics is really the Queen of Sciences, and of technical sciences in particular. However, we want to show mathematics that everyone will understand and like, to show its “human” face and to use it in practice in broadly understood engineering.