Representing all children who must know everything about T. rex, a lad grills his granddad as they take in a dinosaur show at the museum: “How were his teeth, his terrible teeth? / Were they sharp? Were they long? / Were they terribly strong?” Granddad answers as best he (and modern paleontology) can, but often he’s forced to protest that, “It was millions and millions of years ago!” Using intensely hued acrylics applied in broad, visible brushstrokes, Bartlett depicts the two visitors examining dioramas of toothy carnivores in action (even engaged in a rather gory meal), then moving on to fossils, smaller scenes, and, at last, the inevitable dinosaur gift shop. French intersperses brief prose commentary to fill in some of the blanks, and has Granddad turn the tables on his young interrogator by suggesting that he—and by extension, readers—might one day themselves answer some of the many questions remaining about T. rex. That’s an energizing idea for young dinosaur fans. (index) (Picture book/nonfiction. 5-7)