Stephen Jay Gould Quote

Biological evolution is a system of constant divergence without subsequent joining of branches. Lineages, once distinct, are separate forever. In human history, transmission across lineages is, perhaps, the major source of cultural change. Europeans learned about corn and potatoes from Native Americans and gave them smallpox in return.

"The Panda's Thumb of Technology", p. 65 - Bully for Brontosaurus (1991)