  In high-energy nuclear collisions, the new phase of the quark-gluon plasma is
indicated by an anomalous increase in pressure, an excess of direct photon
production, an excess of strangeness production, and an anomalous J/psi
suppression. We review these signatures and discuss how recent high-energy
heavy-ion experiments at CERN are consistent with the production of the
quark-gluon plasma in high-energy Pb+Pb collisions.
