"An ambitious plan took hold at Berkeley... to build an accelerator that would speed s such that when smashed into a target, there would be enough energy to produce an . ...When energy turns into massive particles they emerge in pairs, a particle... matched with its antiparticle, so the BeVatron was built with enough power to produce an antiproton in conjunction with a proton... Several ideas on how to isolate the antiproton 'needle' from the particle 'haystack' were presented... A small team... of , Emilio Segre, , and won the competition ...their idea worked ...and in 1955 they announced their discovery. One of the other teams led by that had entered the competition also gained success... with the discovery of the in 1957. So thirty years after Dirac['s]... seminal prediction, the basic pieces of the antiworld were in place: , antiproton, and ."