The Exploratorium presents a preschool science Web site. The materials on this site were compiled specifically to address how to introduce preschool age children (ages3-5) to the field of science. Teaching science to preschoolers requires a different approach than would be used in the elementary and secondary schools. Young children require science to be an experiential activity--hands on fun, which is also educational. The materials available on this site are collected from the Exploratorium's Learning Studio. Under the heading of science we have included mathematics, science and technology, earth science, biology, and the five senses. We have also created a Web page of pedagogical information that includes both print sources and Web sites.