At the Triassic, Jurassic, and Cretaceous signs, the family paused on the chalk line that curled from the hall to the grass. Ren crouched by the string and said, “Dinosaurs didn’t all live at once. This part lasted a very, very long time.”

Sam touched the notebook in a back pocket. “So the ones in my dinosaur book were mixed up?” Sam asked. Mina lifted her magnifying glass and said, “That’s sneaky.” Ren smiled. “A little. Stegosaurus and T. rex were separated by millions of years—like far-apart chapters in one giant story.”