Feynman later proposed this interpretation of the positron as an electron moving backward in time in his 1949 paper &quot;The Theory of Positrons&quot;.[2] Yoichiro Nambu later applied it to all production and annihilation of particle-antiparticle pairs, stating that &quot;the eventual creation and annihilation of pairs that may occur now and then is no creation or annihilation, but only a change of direction of moving particles, from past to future, or from future to past.&quot;[3]<p>This sounds like SciFi material.