**3. Contents and organization of the book**

In the next six chapters of the book, some of the recent novelties in the two fields of superconductivity and superfluidity are reviewed both from a theoretical and an experimental point of view. The book is organized into two sections: (1) the first section contains three chapters dealing with the recent developed theoretical models and measurements carried out in superconductors and (2) the last three chapters contained in the second section report on the theoretical advancement together with the most sophisticated experimental techniques in superfluidity. In more detail, Chapter 2 reviews the main properties of the intermediate state in type-I superconductors and the main theoretical models to interpret it. Chapter 3 reports the recent experiments on some emerging superconductors, the bismuth chalcogenides, and the BiS<sup>2</sup> -based layered superconductors with special regard to the correlation between crystal structure and superconductivity. Chapter 4 reports on the effect of isovalent substitutions and heat treatments on some physical properties of high-critical temperature superconductors by means of advanced experimental techniques. Chapter 5 presents an advanced theory in the field of superfluids on the Kelvin wave and knot dynamics on three-dimensional deformed knot-crystal and its relation with deformed space-time. Chapter 6 outlines an effective field theory applied to study vortices and solitons in superfluid Fermi gases. Chapter 7 describes an experimental technique that is able to produce hydrogen-free liquid helium and illustrates how to solve the flow impedance blocking issue.
