A physicist at work #OnThisDay in 1928, Paul Dirac published a paper predicting the existence of #antimatter, which won him the Nobel Prize in 1933. Here we see a snippet from a 1975 lecture by Paul Dirac, in Italy Accademia Nazionale dei Lincei where he explains the history of the discovery of the positron. The lecture describes the anatomy of a discovery from prediction to observation and illustrates CERN’s culture of collaboration. Watch the full lecture on La Mediateca INFN - Istituto Nazion