using standard courier delivery
The title is a pun, and as always with Gould the joke has a point that illustrates the largest pattern of life's history. For millennia the animals that populated the earth had four toes on each foot, or six. If evolution had taken a tiny shift - if our ancestors had inherited a couple of genes in a different form - our canonical number, based on our fingers and toes, might be eight instead of ten. This is just one of the oddities of history that Gould deploys in this wonderfully readable book
Stephen Jay Gould was the Alexander Agassiz Professor of Zoology and Professor of geology at Harvard and the curator for invertebrate palaeontology in the university's Museum of Comparative Zoology. He died in May 2002.