For MMGM, I am recommending The Fourteenth Goldfish by Jennifer L. Holm.
Here's the publisher's description:
Believe in the possible . . . with this New York Times bestseller by three-time Newbery Honor winner Jennifer L. Holm. A perfect Father’s Day 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 gawky teenager 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. Look for EXCLUSIVE NEW MATERIAL in the paperback—including Ellie’s gallery of scientists and other STEM-appropriate features.
This book is great! One thing that I love about it is its combination of life lessons (such as about the circle of life and about how scientific discoveries can change the world, for better or worse) and a story that is often funny and optimistic. The premise of the book (of someone reverting to a younger age and wanting to reveal the discovery so that people can avoid old age) is very unique and interesting, but the book is not really a science-fiction book, as opposed to a realistic story with some science-fiction thrown in. The book's main character, Ellie, is a great narrator for the story, and the way her life changes (such as by making new friends and losing old ones) is another great part of the book. The Fourteenth Goldfish is a great read with many important things to say!