2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48034We discuss possible measurements and origins of single spin asymmetries in DIS and of some unusual spin properties of vector mesons produced in lepton- nucleon, photon-nucleon and photon-photon interactions. Such effects have already been observed in other processes.5 pages, LaTeX, no figures; talk delivered by M. Anselmino at the Workshop on "Physics and Instrumentation with 6-12 GeV Beams", June 15-18, 1998, Jefferson Lab, Newport News, VirginiaHigh Energy Physics - Phenomenologytext