The sciences do not try to explain, they hardly even try to interpret, they mainly make models. By a model is meant a mathematical construct which, with the addition of certain verbal interpretations, describes observed phenomena.
—John von Neumann
What is the use of a book, thought Alice, without pictures?
—Lewis Carroll
In 1992, Dorothy Keenan, a social worker in Catawba County, North Carolina, had a problem. She was interviewing a boy named Douglas about his family history. As Douglas talked about his relatives, Dorothy took notes. After the interview, Douglas reviewed her notes ...
