Neutrinos: Opening new doors

In this contribution, which introduces the ‘Crossing the Portal’ session of the NOW 2024 meeting, I discuss the value of the concepts of interdisciplinarity and innovation for neutrino physics. After some historical considerations, which provide an initial illustration of the significant role of these concepts, I review some well-known cases of neutrino science, involving both astrophysics and particle physics, which allow us to deepen the analysis. The importance of a harmonious relationship between theoretical elaborations and experiments emerges: effective collaboration between theoretical and experimental physicists played a key role in many of the successful cases and proved marginal or defective in the doubtful ones. The discussion highlights also the need to proceed armed with a patience, a virtue that Feynman himself (What is science Phys. Teach. 7, 313, 1969) indicated as essential to science, all the more necessary when investigating interesting but elusive particles such as neutrinos.