from effects due to final state interactions in the QGP matter that forms from it. At RHIC, the best experimental handle on the ${\rm \bf dA}$ term happens to be the study of $D+A$ reactions. In such light-heavy ion reactions, the initial state CGC physics can be isolated because the produced QGP, if any, is too tenuous.

Why don’t I add more terms in Eq.(\[qgpdef\])? In fact, each term stands for many independent components, as I elaborate below. For the three required terms in Eq.(1) the published experimental evidence is now overwhelming and conclusive. Four independent experiments have converged to complementary very high quality data sets.

The three terms in Eq.(1) are necessary and sufficient for establishing that a discovery has been made of a uniquely different form of strongly interacting QGP. After discussing the three lines of evidence, I will elaborate on why I believe that direct photons, $J/\psi$, HBT, or other interesting observables do not need to be added to Eq.(1). Those observable provide valuable additional constraints on the [*combined and convoluted*]{} properties of the initial state, the QGP, [*AND*]{} the dense hadronic matter into which it condenses. However, the deconvolution of the initial and hadronic final effects 