The electron liquid paradigm is at the basisof most of our current understanding of the physical properties ofelectronic systems. Quite remarkably, the latter are nowadays atthe intersection of the most exciting areas of science: materialsscience, quantum chem- istry, nano-electronics, biology, andquantum computation. Accordingly, its importance can hardly beoverestimated. The field is particularly attractive not only forthe simplicity of its classic formulation, but also because, by itsvery nature, it is still possible for individual researchers, armedwith thoughtfulness and dedication, and surrounded by a small groupof collaborators, to make deep contributions, in the best traditionof "small science".