Franklin Delano Roosevelt, President

This title in the Millennium series of illustrated SF is a striking time-travel story by much-honored Silverberg. Twins Eric and Sean Gabrielson, a paleontologist and a physicist, are chosen as the first human subjects of a secret Cal Tech experiment in 2016 that will transport them into the past and the future. As if on a pendulum, they are automatically shunted back and forth, at increasing distancesa few minutes, hours, years, centuries. . . . Their brief stays in other times produce vivid, dreamlike vignettes: encounters with their younger selves, with robots, Neanderthals, aliens and dinosaurs, each era with its own smell and taste. This imaginative story, suggesting much more than is stated in its brief length, is a deft evocation of Silverberg's theme of dislocation. Ages 12-up. (September)