Rich kids are in pre-K; poor ones are with Grandma

By age 3, inequality in the United States is clear: Rich children attend school. Poor kids stay with a grandparent or other caretaker, according to research by authors of a new book, Cradle to Kindergarten: A New Plan to Combat Inequality.

Only 55 percent of America’s 3- and 4-year-olds attend formal preschool. Compare that with China, where 75 percent of toddlers are in school. Or Germany and Britain, where more than 90 percent of kids are.