In the universe nothing is stationary. All of its components move, and occasionally merge. These processes affect atoms and galaxies, and also affect people. In astronomical research one of the most fertile mergers occurred 40 years ago between two excellent scientists: Bruce G. Elmegreen and Debra M. Elmegreen. As well as husband and wife, they are also one of the most important couples in contemporary Astrophysics. They not only share their lives but also have common scientific interests: they are among the world's leading experts in the formation and evolution of galaxies. Bruce and Debra Elmegreen collaborate on a regular basis with several research groups at the Instituto de Astrofísica de Canarias (IAC). Towards the end of 2014 they worked for a period at the IAC within the "Visiting Scholars Programme" of the Jesús Serra Foundation.