2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55684We give a brief history of the passage from strings to branes and we review some aspects of the following topics in M-theory: (a) an extended brane scan, (b) superembedding approach to the dynamics of superbranes and (c) supermembranes in anti de Sitter space, singletons and massless higher spin field theories.51 pages, latex, 2 figure files, uses sprocl.sty, contribution to the Abdus Salam Memorial Meeting, 19-22 Nov 1997, Trieste, Italy, a paragraph with new references addedHigh Energy Physics - Theorytext