2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45017I discuss (i) hadron-hadron and photon-hadron total cross-sections, (ii) elastic scattering, (iii) the rôle of minijets in total cross-sections and the need to include them in Monte-Carlos for small-$x$ structure functions, (iv) how the two pomerons affect small-$x$ behaviour, and (v) rapidity-gap physics.talk at workshops at Kyffhaüser and DESY, September 1993 6 pages + 9 figures (not included) plain texHigh Energy Physics - PhenomenologySmall $x$ and Small $Q^2$text