Twenty-five years ago, the still-resonant report "A Nation at Risk" urged schools to add more time--an hour to the usual six hour day and 20-40 days to the typical 180-day ear--to ward off a "rising tide of mediocrity" in American education. Today, city, school, state, and national leaders are engaged in a renewed effort to do…

Every year 1.3 million U.S. high school students drop out of school with one quarter of female students failing to graduate on time. Female dropouts are more likely to be unemployed, to earn less when they are employed, to become pregnant before the age of 20, to become obese, to smoke, and to drink more heavily than their male counterparts. This…