  Using the theory of the high temperature superconductivity based on the idea
of the fermion condensation quantum phase transition (FCQPT), we show that
neither the d-wave pairing symmetry, nor the pseudogap phenomenon, nor the
presence of the Cu-O_2 planes are of decisive importance for the existence of
the high-T_c superconductivity. We analyze recent experimental data on this
type of superconductivity in different materials and show that these facts can
be understood within the theory of superconductivity based on FCQPT. The latter
can be considered as a universal cause of the high-T_c superconductivity. The
main features of a room-temperature superconductor are discussed.
