Published for the first time in Vintage.
Stephen Jay Gould (1941-2002) was the Alexander Agassiz Professor of Zoology and Professor of Geology at Harvard University and the curator for invertebrate palaeontology in the University's Museum of Comparative Zoology. He is the author of over twenty books, and received the National Book Award, the National Book Critics Circle Award, and the MacArthur Fellowship. He died in May 2002.