Volume 29, Number 3, May/June 1997 1980, the rate increased by 61% among adolescents, by 69% among women aged 20–24, by 67% among 25–29 year-olds and by 82% among women aged 30–34.2 Indeed, the rates for these latter groups have continued to rise since 1991, even as the birthrate among adolescents has stabilized and turned slightly downward. As a result of these trends, nonmarital births now ac...

Apparent complexity may come more from the problem than from the system that learns to solve it. Simon (1969) illustrated this by describing the path of an ant making its homeward journey on a pebbled beach. The path seems complicated. The ant probes, doubles back, circumnavigates, and zigzags. But these actions are not deep and mysterious manifestations of intellectual power. Closer scrutiny r...