As children read less and fail to build up a vocabulary, the author of a new book says in an interview the vocabulary deficit is a worrying trend that threatens confidence, future job prospects, relationships, and even the ability to understand jokes. "Every child should have a dictionary. Just by looking up a new word, the process mentally glues it into the memory. Words are slippery customers – you need a definition and understanding of the various contexts it might be used in," asserts...