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? Lexile recommendation: 550

"Believe in the unexpected" with this hilarious, heartwarming, and much-anticipated sequel to the New York Times bestseller The Fourteenth Goldfish! Ellie's grandpa Melvin is a world-renowned scientist . . . in the body of a fourteen-year-old boy. His feet stink, and he eats everything in the refrigerator—and Ellie is so happy to have him around. Grandpa may not exactly fit in at middle school, but he certainly keeps things interesting. When he and Ellie team up for the county science fair, no one realizes just how groundbreaking their experiment will be. The formula for eternal youth may be within their reach! And when Ellie's cat, Jonas Salk, gets sick, the stakes become even higher. But is the key to eternal life really the key to happiness? Sometimes even the most careful experiments yield unexpected—and wonderful—results.