  The first evidence for Quantum Chromodynamics (QCD), the theory of the strong
interactions, came from the systematics of baryon and meson spectroscopy. An
important early observation was the apparent absence of exotics, baryons
requiring more than three quarks or mesons requiring more than quark-antiquark.
Years later, QCD is well established, hadron spectroscopy has been relatively
inactive, but the absence of exotics remains poorly understood. The recent
observation of narrow, prominent exotic baryons has stirred up new interest in
hadron spectroscopy. At present the experimental situation is confused; so is
theory. The recent discoveries are striking. So too is the complete absence of
exotic mesons, and, except for the recent discoveries, of exotic baryons as
well. Whether or not the new states are confirmed, the way we look at
complicated states of confined quarks and gluons has changed. Perhaps the most
lasting result, and the one emphasized in these notes, is a new appreciation
for the role of diquark correlations in QCD.
