The two worlds was programmed and controlled by advertising agencies, serving their clients. This was turning into a big-money world, and it provided the networks with their total revenue. The other half reflected the nation's non-profit structure: education, religion, social services. It lived on skimpy rations, necessarily seasoned with dedication. The two worlds used the same studios and were served by the same studio engineers. But they tended to draw on different writers and directors. There was little interaction between the two worlds. Yet they served as valuable supplements to each other. Sponsored broadcasting, an observer noted, was often in danger of sliding into prostitution. Educational broadcasting, on the other hand, was in danger of dying an old maid. Memories from school history courses were coming to life on the air, in stellar productions. The series won many educational awards.