Atomic nuclei are samples of quantum Fermi fluids. Their size classifies them as mesoscopic systems, whose properties are intermediate between quantum mechanical microscopy and quantum, or classical bulk behavior. The Moretto group has developed a nuclear mesoscopic thermodynamics and have applied it to the interpretation of nuclear reactions in a variety of regimes. For instance, they have predicted, and experimentally found the disappearance of strong quantum structures with increasing excitation energy. Very recently by means of strong scaling techniques they have visualized the presence of temperature dependent shell effects and nuclear superconductivity in the energy dependence of fission probabilities. The same insight has led them to the prediction and experimental verification of statistical emission of complex fragments (of mass greater then an alpha particle) from excited nuclei. They have tracked this process of fragment emission up to very high energies, where several fragments can be emitted in a single reaction event. This reaction is called multifragmentation.