The paper by Mihos and Hernquist investigates the development of gaseous inflows and starburst activity in mergers of comparable-mass disk galaxies using numerical simulations. They find that strong gaseous inflows occur in all encounters, leading to moderate to intense starburst activity. The structure of the galaxies plays a dominant role in regulating this activity. Galaxies with dense central bulges experience stronger inflows during the final stages of merging, while bulgeless galaxies show weaker inflows and earlier starbursts. Orbital geometry has a relatively minor impact on the onset of collisionally-induced activity. The inflows are primarily driven by gravitational torques from the host galaxy, and dense bulges stabilize galaxies against bar modes, delaying the onset of strong inflows until the galaxies merge. The strongest inflows and starbursts occur in co-planar encounters, while inclined mergers show less intense activity. The starbursts in mergers of galaxies with central bulges represent a significant increase in the star formation rate compared to isolated galaxies. The authors suggest that the internal structure of merging galaxies, rather than orbital geometry, may be the key factor in producing ultraluminous infrared galaxies. They also discuss the implications of their findings for the evolution of galaxies and the triggering of nuclear activity.The paper by Mihos and Hernquist investigates the development of gaseous inflows and starburst activity in mergers of comparable-mass disk galaxies using numerical simulations. They find that strong gaseous inflows occur in all encounters, leading to moderate to intense starburst activity. The structure of the galaxies plays a dominant role in regulating this activity. Galaxies with dense central bulges experience stronger inflows during the final stages of merging, while bulgeless galaxies show weaker inflows and earlier starbursts. Orbital geometry has a relatively minor impact on the onset of collisionally-induced activity. The inflows are primarily driven by gravitational torques from the host galaxy, and dense bulges stabilize galaxies against bar modes, delaying the onset of strong inflows until the galaxies merge. The strongest inflows and starbursts occur in co-planar encounters, while inclined mergers show less intense activity. The starbursts in mergers of galaxies with central bulges represent a significant increase in the star formation rate compared to isolated galaxies. The authors suggest that the internal structure of merging galaxies, rather than orbital geometry, may be the key factor in producing ultraluminous infrared galaxies. They also discuss the implications of their findings for the evolution of galaxies and the triggering of nuclear activity.