Hating change and missing both her best friend and her dead goldfish, 11-year-old Ellie encounters a boy who strongly resembles her immortality-obsessed grandfather, in a story that introduces the work of famous historical scientists. By the three-time Newbery Honor-winning author of Turtle in Paradise. - (Baker & Taylor)

Believe in the possible . . . with this "warm, witty, and wise" New York Times bestselling novel from three-time Newbery Honor winner Jennifer L. Holm. A perfect read about a child's relationship with her grandfather!
 
Galileo. Newton. Salk. Oppenheimer.
Science can change the world . . . but can it go too far?
 
Eleven-year-old Ellie has never liked change. She misses fifth grade. She misses her old best friend. She even misses her dearly departed goldfish. Then one day a strange boy shows up. He’s bossy. He’s cranky. And weirdly enough . . . he looks a lot like Ellie’s grandfather, a scientist who’s always been slightly obsessed with immortality. Could this pimply boy really be Grandpa Melvin? Has he finally found the secret to eternal youth?
 
With a lighthearted touch and plenty of humor, Jennifer Holm celebrates the wonder of science and explores fascinating questions about life and death, family and friendship, immortality . . . and possibility.

And don’t miss the much-anticipated sequel, The Third Mushroom!

"Warm, witty and wise"—The New York Times

"Awesomely strange and startlingly true-to-life. It makes you wonder what's possible." -- Rebecca Stead, Newbery Medal-winning author of When You Reach Me

SUNSHINE STATE AWARD FINALIST! - (Random House, Inc.)

JENNIFER L. HOLM's father was a pediatrician and she grew up listening to him talk about the wonder of antibiotics and how science could change the world. Today Jennifer is the NY Times bestselling author of three Newbery Honor Books, as well as the co-creator of the Babymouse series (a 2013 Eisner Award Winner) and Squish series, which she collaborates on with her brother Matthew Holm. - (Random House, Inc.)

Booklist Reviews

*Starred Review* It's a little strange for 11-year-old Ellie when her mother brings home a boy who looks to be about 13 but dresses like Ellie's grandfather. But it's a shocker when Ellie realizes that the kid is her grandfather, a scientist who has suddenly succeeded in reversing the aging process. Now sleeping in their den and newly enrolled in Ellie's middle school, Grandpa connives with her to sneak into his old lab and swipe what he needs to continue his research. Meanwhile, Ellie comes to admire the grandfather she has barely known, listens to his stories of famous scientists, and discovers her own passion for science. Written in a clean, crisp style, with lively dialogue and wit, this highly accessible novel will find a ready audience. The idea of an adult in a young teen's body may not be new, but Ellie's first-person narrative makes good use of the situation's comic potential, particularly in the fractious, role-reversed relationship between Mom and Grandpa. Along with the comedy, the story has a reflective side, too, as Ellie thinks through issues such as death and immortality and confronts Grandpa with the social consequences of his research. A great choice for book groups and class discussions as well as individual reading. HIGH-DEMAND BACKSTORY: A three-time Newbery Honor–winning author, whose books have also ranked on the New York Times best-seller lists, Holm has a formidably sized fan base waiting for her next release. Copyright 2014 Booklist Reviews.

Horn Book Guide Reviews

Ellie's science-obsessed grandfather finds a way to physically be thirteen again, and his grumpy seventy-six-year-old personality and the limitations of early adolescence make for a comical combination. With its richly entertaining premise, this novel is a breezy read, but it also manages to show off the potential of science and raise big questions about age and ethics.

Kirkus Reviews

What would it be like if your grandfather turned up in your house as a 13-year-old boy?For sixth-grader Ellie, this leads to a recognition of the importance of the cycle of life and the discovery of her own passion for science. After her scientist grandfather finds a way to regain his youth, he's denied access to his lab and must come to live with Ellie and her mother. Although he looks young, his intellect and attitudes haven't changed. He still tells Ellie's mother what to wear and when to come home, and he loathes middle school even more than Ellie does. There's plenty of opportunity for humor in this fish-out-of-water story and also a lesson on the perils as well as the pluses of scientific discovery. Divorced parents, a goth friend and a longed-for cellphone birthday present are among the familiar details setting this story firmly in the present day, like Holm's Year Told Through Stuff series, rather than in the past, like her three Newbery Honor–winning historical novels. The author demonstrates understanding of and sympathy for the awkwardness of those middle school years. But she also gets in a plug for the excitement of science, following it up with an author's note and suggestions for further exploration, mostly on the Web.Appealing and thought-provoking, with an ending that suggests endless possibilities. (Science fiction. 10-14) Copyright Kirkus 2014 Kirkus/BPI Communications.All rights reserved.

Publishers Weekly Reviews

Middle school doesn't start smoothly for 11-year-old Ellie, whose best friend finds her passion (volleyball) and new teammates to eat lunch with, while Ellie flounders, uninterested in sports or her parents' avocation, theater. A startling addition to the household helps Ellie get her groove back when Grandpa Melvin, a scientist, moves in after engineering a cure for aging (the regenerative properties of jellyfish are involved) and transforming himself into a teenage boy. Though Melvin dresses and acts like the crotchety old man he was, he and Ellie bond over spirited discussions about Jonas Salk, Robert Oppenheimer, the possibilities of science, and the moral questions scientific advances can raise. Though the subject matter has a lot of intellectual heft, the writing has Holm's ever-present light touch. The small cast, which refreshingly includes divorced parents who treat each other respectfully, is so well realized that the farfetched aspects of the plot seem almost plausible. This is top-notch middle-grade fiction with a meaty dilemma, humor, and an ending that leaves room for the possibility of a sequel. Ages 8–12. Agent: Jill Grinberg, Grinberg Literary Management. (Aug.)

School Library Journal Reviews

Gr 5–7—Eleven-year-old Ellie Cruz's life changes dramatically when her mother brings a teenage boy home one night and she learns it is her estranged grandfather. Melvin is a scientist who has figured out how to reverse aging and is now 13 again. Tensions are high between Melvin and his adult daughter, Ellie's mother, but Ellie feels like she now has the opportunity to really get to know her grandfather. Her interest in science blossoms, and she is eager to help Melvin retrieve the jellyfish specimen he used in his experiments so he can publish his discovery. Fascinated, Ellie learns about the work of Jonas Salk, Robert Oppenheimer, and Marie Curie. But as she learns more, she realizes that scientific discoveries often have unforeseen consequences. Readers are carried along with Ellie as she navigates old and new friendships in her first year in middle school with the added complication of her teenage grandfather at the same school. Short chapters keep the story moving at an engaging pace, and the interactions among the characters will easily hold readers' interest. Ellie's growing relationship with her grandfather helps her make discoveries about herself. Melvin, who begins as unapologetically single-minded in his determination to continue his work, also learns from Ellie. With humor and heart, Holm has crafted a story about life, family, and finding one's passion that will appeal to readers willing to imagine the possible.—Amanda Raklovits, Champaign Public Library, IL