The story of the siblings is placed in the center of a two-page spread, while fold-out leafs on either side provide inventor features. Each inventor-section includes a portrait, name, dates, most famous invention, "fast facts," and a short biography on the interior. Two-page feature spreads on inventors are also integrated throughout, with other features representing what Herbie is writing in his notebook. 35 pages, hardcover. Oversized book, 11" x 10".