Evolutionary theory has always been plagued by scantiness of evidence. We see the products of evolution but not much of the process. Most of the story happened long ago, and little remains of the early stages. Especially few traces of behavior remain; only recently were there artifacts that could endure. Verbal behavior left no artifacts until the appearance of writing, and that was a very late...

The year 2007 marked the 50th anniversary of the publication of B. F. Skinner’s Verbal Behavior, a book that by Skinner’s own account was his most important. The received view, however, is that a devastating review by a young linguist not only rendered Skinner’s interpretation of language moot but was also a major factor in ending the hegemony of behaviorism in psychology and paving the way for...