  We make a theoretical and experimental summary of the state-of-the-art status
of hot and dense QCD matter studies on selected topics. We review the Beam
Energy Scan program for the QCD phase diagram and present the current status of
search for QCD Critical Point, particle production in high baryon density
region, hypernuclei production, and global polarization effects in
nucleus-nucleus collisions. The available experimental data in the strangeness
sector suggests that a grand canonical approach in thermal model at high
collision energy makes a transition to the canonical ensemble behavior at low
energy. We further discuss future prospects of nuclear collisions to probe
properties of baryon-rich matter. Creation of a quark-gluon plasma at high
temperature and low baryon density has been called the "Little-Bang" and,
analogously, a femtometer-scale explosion of baryon-rich matter at lower
collision energy could be called the "Femto-Nova", which may possibly sustain
substantial vorticity and magnetic field for non-head-on collisions.
