  The exploration of the QCD phase diagram is the goal of many experiments in
the world. The low net baryon density region is relatively well studied, while
the one corresponding to higher net densities still contains multiple
unrevealed puzzles getting significant attention. In multiple experimental
complexes such as STAR or HADES, the heavy ions collide at relatively lower
energies than those obtained at LHC, creating "not the hottest soup" of nuclear
matter. The examination of it provides unique insights into understanding the
properties of matter production and its transitions. In this paper, several of
the significant experimental discoveries are reviewed.
