How and Why Wonder Books were a series of American illustrated books published in the 1960s and 1970s that were designed to teach science and history to children and young teenagers. The series began in 1960 and was edited under the supervision of Paul E. Blackwood of the Office of Education at the U.S. Department of Health, Education and Welfare. The series was published by Wonder Books, Inc., a division of Grosset & Dunlap.