Provided by Lawrence Hall of Science at the University of California-Berkeley, the goal of the GEMS Web site is to provide hours of family fun while developing inquiry skills and building positive attitudes toward science and learning. Although a majority of the products and activates on the site must be ordered, several are provided free of charge on the GEMS Teacher's Guides: Online Activities page. These quality products include Star Clock and Alien Juice bar activities, among others. The Juice bar activity, for example, lets students learn about acids and bases and the pH scale through an interactive and colorful online game.