100 things to know about

Among the samples, heights range roughly 8.4–9.5 inches, widths about 5.4–6.7 inches, depths roughly 0.5–0.95 inches, and weights about 0.75–1.23 pounds.

They use short, numbered entries or bite-sized topics arranged as up to 100 items, often combining history, trivia, lists, quick facts, and occasional suggested activities.

Fan-focused books commonly use a format like '100 Things... Fans Should Know,' while children's and science titles use '100 Things to Know about...'

The children's science book is 128 pages in a 9.5" × 6.7" hardcover. Its description highlights colorful infographics, bite-sized topics, and internet links to specially selected websites for further reading.

A variety of writers contribute, including Andy P Smith & Jason Gershuny; Terry Foster; Gillian G Gaar; Sean Callahan; David Fischer; Alex Frith & Jerome Martin & Minna Lacey & Jonathan Melmoth; Bryan Alvarez & Lance Storm; and Lou Prato.