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

In developing quantum mechanical theory, physicist Paul Dirac, born on this day, predicted that all matter has a kind of mirror image - antimatter. Dirac's theory was revolutionary, and later would be proved experimentally. He was awarded the #NobelPrize in 1933 which he shared with Erwin Schrödinger. Dirac was only 31 years old when he received the award. Video: A short glimpse of Professor Paul Dirac after his arrival in Stockholm for the Nobel Prize award ceremony held on 10 December 1933. ©