It’s not about time; it’s about relevance. Each year, nearly one in four American teenagers drops out of high school. Twenty other countries now have higher high-school graduation rates. This makes no sense. Of all the countries in the world, the United States is one of the worst places to be a high-school dropout. The unemployment rate for recent dropouts is 50 percent. Without a diploma, you can’t work as a garbage collector in New York City; you can’t join the Air Force.