"This step-by-step guide is a valuable aide. . . A go-to resource for passionate creators who are ready to actively invent and design."—BooklistHave you ever wanted to build your own mobile apps? App Inventor, a free and revolutionary online program from MIT, lets you do just that. With the help of this companion guide chock-full of colorful graphics and easy-to-follow instructions, readers can learn how to create six different apps, including a working pi...