Gr 3-6-Kent focuses on Molina's early education and subsequent research on the ozone layer and air quality and explains scientific principles related to his work in colored inserts. Explanations of lasers and chlorofluorocarbons are simplistic, but appropriate for the book's target audience. Stein introduces Zapata as a reluctant participant in the Mexican Revolution who fought to champion the cause of poor farmers. Some considered Villa a Robin Hood while others called him a brutal murderer. Stein carefully separates legend from fact and shows both sides of the man's character and his role in the Revolution. These are welcome report sources for three underrepresented subjects. All three books contain sharp, black-and-white and full-color photos.-Donna Cardon, Provo City Library, UT Copyright 2004 Reed Business Information.