Teachers blame the bear market in part on No Child Left Behind, which requires schools to get students up to state targets in reading and math by 2014 or face sanctions that could result in school takeovers or closings. “Curriculums are so much tighter than they used to be,” says Susan Lewis, an elementary-school teacher in San Antonio, Texas. Add in rising transportation costs, and field trips are fast becoming history. Compton Avenue Elementary School in Los Angeles has halved its trips in the past three years. “They were all academically based,” says principal Claudia Ross, but they no longer fit a budget focused on test scores, not general enrichment.

Museums are coming up with new strategies to lure schools back. The Chicago Children’s Museum sends teachers a checklist that highlights how the museum can help them meet Illinois state standards, while representatives from the New England Aquarium visit schools in Massachusetts to explain how its programs can give kids a boost. Many museums have also started giving their young visitors clipboards, worksheets, science journals and the chance to quiz a resident historian or scientist. “We know it’s directly linking into the standards,” Bortoli says. “But I don’t think the kids notice.” They’re happy as long as they don’t get left behind.