  Heavy-Fermions provide an extreme example of the utility of the idea of
continuity and analyticity in physics. Their discovery and study in the past
thirty years has added a fascinating chapter to condensed matter physics. I
briefly review the origins of the heavy-fermion problem out of the study of
magnetic moments in metals and the study of mixed-valent rare-earth compounds.
I also review the principal ideas underlying the features understood in their
fermi-liquid phase as well as in their anisotropic superconductivity. The
unsolved issues are also briefly mentioned.
