The SMC I band light curves of the OGLE project show a curious absence of familiar Algols. Comparitive statistical work for SMC and Milky Way Algols might uncover an evolutionary explanation, presumably connected with chemical composition, or may point to observational selection or even merely perception. As background, LMC and SMC abundances of nitrogen, oxygen, and neon are lower than in our Galaxy by respective factors of about 2.5 and 6, raising the issue of metallicity effects on semi-detached (SD) statistics – specifically on SD light curves and numbers of SDs. Lobe overflow is a triggered process, with both system age and structural configuration at triggering dependent on composition.