Forty years ago, nearly half of all children walked or rode their bikes to school; now less than 15 percent do, and only 25 percent of kids who live within a mile of their school get there by their own power. Allowing kids to hoof it to class will save on gas and wear and tear on your car, and keep your young scholars healthier and more independent. For parents who worry that the world is a more dangerous place than when they were kids, Lenore Skenazy, author of Free Range Kids, points out that although the crime rate rose in the 1970s and 1980s, it peaked in 1993, when it began dropping. Now it is virtually the same as it was in 1970.