  This is a brief introduction to the closing discussion of the IAU Symposium
295, "The Intriguing Life of Massive Galaxies", that was held in Beijing from
August 27 through 31, 2012. The discussion was focused on only four hot items,
namely 1) the redshift evolution of the size of passively evolving galaxies, 2)
the evolution with redshift of the specific star formation rate, 3) quenching
of star formation in galaxies and dry merging, and 4) the IMF.
