Summary: "The Fourteenth Goldfish" is a middle-grade novel by Jennifer L. Holm. The story follows a 12-year-old girl named Ellie, who is struggling with the typical challenges of adolescence. One day, her grandfather, Melvin, shows up at her doorstep looking exactly like he did when he was 13 years old.

Melvin, a scientist, has discovered a way to reverse aging and has turned himself into a teenage boy. He enlists Ellie's help to retrieve a special enzyme that he needs to continue his research, which is located at his old lab.

As they work together, Ellie learns about the importance of scientific discovery and the potential consequences of playing with the laws of nature. She also develops a deeper understanding of her grandfather and the challenges he faced in his own life.

"The Fourteenth Goldfish" is a heartwarming and humorous story about the bonds of family and the power of scientific inquiry. It encourages readers to explore their curiosity, embrace their passions, and appreciate the people around them.