Last summer reality TV dominated American TV screens, and reruns of winter shows died. So this summer networks flooded screens with new reality shows and the reruns (mostly) disappeared. So what’s popular? “Thirteen reality programs had premieres during May and June, and not one has cracked the Top 10 list, according to the most recently available A.C. Nielsen Co. ratings (for the week ending July 6). Reruns of sitcoms and dramas, meanwhile, have dominated the upper echelons of the ratings.”