It was a chill, windy morning and the producers of NBC Reports had put out their call for identical twins only three days before. When they saw that as many as 32 sets had shown up outside New York’s McGraw-Hill Building, they naturally did a double take. Ranging in age from 6 months to 12 years, the youngsters—who were not paid—served as teeth-chattering illustrations for an upcoming documentary, Medicine in America: Life, Death, and Dollars. Rounded up through three Mothers of Twins clubs, the kids will appear in a segment on genetic engineering that examines cloning, the artificial duplication of genes that could ultimately lead to planned duplication of people. That’s in the long run. In the short run, the producers’ genetic problem was to keep the frisky twins under control and make sure the hammier mothers stayed off camera. The show, which will be broadcast Jan. 4, will be hosted by Tom Snyder, Tom Snyder.