Fort on Fourth Street, The: A Story about the Six Simple Machines

Building a fort in the backyard, a grandfather and granddaughter get help from six simple machines: lever, pulley, inclined plane, wheel and axle, screw, and wedge.

In addition to Cash Kat, Christina Wald has illustrated Fibonacci Zoo, A Cool Summer Tail, A Warm Winter Tail, Habitat Spy, Little Red Bat, and Henry the Impatient Heron for Arbordale. She also enjoys illustrating a wide variety of toys, games, books, and magazines. From a book that featured hundreds of animals on each page (Look, Find, and Learn: Animals of the World) to games including the Star Wars role playing game series, every assignment covers something new and exciting. In recent years, she has illustrated tons of different animals for books and other publications. Christina enjoys the research aspect of such projects, saying that each new book is a fascinating new learning experience. She often integrates travel to research for her illustrations. She lives in Ohio with her husband and three cats. Visit Christina's website: http: www.christinawald.com/