2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/140569We review the recent confirmation of quantum entanglement in e+ e- collisions at the BELLE experiment at KEK-B in Japan with neutral B- mesons, and at the KLOE experiment at the DAFNE in Italy with neutral K- mesons. Such effects in the latter system seen already in proton-antiproton collisions by the CPLEAR experiment are also reviewed for purposes of comparison. In addition, the KLOE experiment provides new tests of the CPT theorem and are briefly discussed.6 pages, submitted to Current SciencePopular PhysicsHigh Energy Physics - PhenomenologyPhysics EducationQuantum Physicstext