  This article is based on my Proceedings for the 47th Course of the
International School of Subnuclear Physics on the Most Unexpected at LHC and
the Status of High Energy Frontier, Erice, Sicily, Italy, 2009. Results from
the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) in
nucleus-nucleus and proton-proton collisions at c.m. energy $\sqrt{s_{NN}}=200$
GeV are presented in the context of the methods of single and two-particle
inclusive reactions which were used in the discovery of hard-scattering in p-p
collisions at the CERN ISR in the 1970's. These techniques are used at RHIC in
A+A collisions because of the huge combinatoric background from the large
particle multiplicity. Topics include $J/\Psi$ suppression, jet quenching in
the dense medium (sQGP) as observed with $\pi^0$ at large transverse momentum,
thermal photons, collective flow, two-particle correlations, suppression of
heavy quarks at large $p_T$ and its possible relation to Higgs searches at the
LHC. The differences and similarities of the measurements in p-p and A+A
collisions are presented. The two discussion sessions which followed the
lectures on which this article is based are included at the end.
