Relativistic heavy ion collisions allow one to study Quantum Chromodynamics (QCD) under extreme temperature and density conditions. A new form of matter formed at energy densities above ? 1 GeV/fm~3, Quark-Gluon Plasma (QGP), is predicted in Lattice QCD calculations. One of the most interesting experimental signatures of QGP formation is jet-quenching due to in-medium energy loss when hard-scattered partons pass through the QGP. Direct jet reconstruction in heavy ion collisions has opened a new era of precision studies of jet-quenching. In this summary talk, recent jet measurements in heavy ion collisions and their implications are reviewed and discussed.
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