An inspiring story of young scientists in action, featured on Nova: how schoolchildren in Everett, Washington, worked with their teachers to clean up Pigeon Creek and reclaim it as a salmon spawning ground. Candid color photos of boys and girls of several ethnic groups, plus a text based on recorded conversations with the kids, lend drama and immediacy; additional scientific facts (e.g., how salmon scales tell the age of the fish; how salmon build a nest or ``redd'') appear in boxes. Glossary; index. (Nonfiction. 10-12)