The Fourteenth Goldfish, Jennifer Holm. Science is powerful, learns 11-year old Ellie when her grandfather comes to visit. However, her grandfather doesn't exactly show up as himself, but a teenage version of himself, diguised as her cousin, Melvin. He attends school with her, serves detention and makes a friend in Raj, who discredits the Sagarsky theory. Melvin Sagarsky, the scientist that doesn't make it into any textbooks, is always on the search for the fountain of youth. "Melvin" believes in Ellie and her future as a scientist. The day comes, however, when he must move on, leaving Ellie with a a sense of discovery and possibility.