There’s a common assumption that if someone starts learning a language when they are very young, they will quickly become fluent. Many people also assume that it will become much harder to learn a ...

This study was supported by contracts between the National Academy of Sciences and the Administration for Children and Families of the U.S. Department of Health and Human Services (HHSP233201400020B, ...

Este artículo está disponible en español. Léelo en español. Walk into almost any school in California, and you’ll notice conversations happening in several languages. This is one of the state’s ...