American Journal of PhysicsKlein’s paradoxBarry R. HolsteinPublished Jun 1, 1998• 85 citationsPublisherAbstractKlein’s paradox is shown to be resolved by a careful consideration of Feynman’s picture of antiparticles as negative energy solutions traveling backward in time. Implications associated with the spin-statistics theorem are pointed out.DOI10.1119/1.18891