Here’s a book children can literally dig into! At an excavation site in Montana, young readers hunt for fossils — and clues — to solve a 75-million-year-old mystery. What killed the Tyrannosaurus Rex they’ve discovered? This all-inclusive kit gives readers the chance to extract fossils and bones included with the book. After digging up the bones, children can assemble the mighty meat-eater’s skeleton and display it in a diorama.