Fewer and fewer students are pursuing science and engineering. While immigrants are taking up the slack in many areas, defense laboratories and industries generally require American citizenship or permanent residency. So a crisis is looming, unless careers in science and engineering suddenly become hugely popular, said Robert J. Barker, an Air Force program manager who approved the grant. And what better way to get a lot of young people interested in science than by producing movies and television shows that depict scientists in flattering ways?