Kathryn Brown | Sep 1, 1997 | 7 min read
In Bonnie Hallam's class at Huey Elementary School in Philadelphia, first-graders don't just read about ecology-they make an ecosystem. Every year, a corner of Hallam's classroom becomes a pond. Filling a huge wooden barrel with water, students carefully arrange topsoil, mulch, logs-even goldfish and butterflies. "The kids get so involved," Hallam says. "Everyone has a good time." It's a different scene from a few years ago, when science was scarce in Hallam's class. "I've always liked science