The American Celebrations series is well positioned to plug holes in school units on holidays, with punchy, informative entries on the past and present histories of important days. The colorful layouts feature an ever-shifting mix of period and modern photographs, while sidebars keep things from settling too comfortably into the organizing structure, which is basically consistent throughout: introduction, history, key personalities, celebrations, symbols, and activities (typically including songs, crafts, recipes, and a quiz). Martin Luther King Jr. Day profiles the man who won the Nobel Peace Prize at age 35 and works in other important personalities, such as Rosa Parks. Strong back matter is supplemented by a bounty of interactive options at the publisher's AV2 website, accessible via a code imprinted inside each book.