  The fascinating story of a major discovery at CERN is outlined. The bold
decision to convert its most powerful, and only recently inaugurated, proton
accelerator to a proton-antiproton collider led to the discovery of the W and Z
bosons -- mediators of the weak interaction -- in a record time, at the
experiments UA1 and UA2. The decisive roles of Carlo Rubbia and Simon van der
Meer, who received the 1984 Nobel Prize for physics, are underlined.
