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Hard-scattering of point-like constituents (or partons) in p-p collisions wasdiscovered at the CERN-ISR in 1972 by measurements utilizing inclusive singleor pairs of hadrons with large transverse momentum ($p_T$).  It was generally assumed following a seminal paper by Feynman, Field and Fox(FFF) (and much discussed in a talk that I gave at the 1979 Rencontres deMoriond) that ``everything you wanted to know about hard-scattering and jets''could be measured by these methods. Recently, we found in PHENIX that the$p_{T_a}$ distribution of away side hadrons from a single particle trigger[with $p_{T_t}$] which is a leading fragment of the trigger jet, could not beused to measure the fragmentation function of the away jet as originallyclaimed by FFF. A new formula was derived which both exhibits scaling in thevariable $x_E\sim p_{T_a}/p_{T_t}$ (a hot topic in 1979) and relates $x_E$,$\sim$ the ratio of the transverse momenta of the measured particles, to$\hat{x}_h=\hat{p}_{T_a}/\hat{p}_{T_t}$, the ratio of the transverse momenta ofthe away-side to trigger-side jets. Tests of the validity of the formula andapplications to Au+Au central collisions at RHIC (where jets can not bereconstructed) are discussed.

Where Feynman, Field and Fox failed and how we fixed it at RHIC