I just got back from a pretty remarkable lecture by the husband-and-wife team of Peter and Rosemary Grant. The Grants started studying Darwin’s finches on the Galapagos Islands in 1973, and they made some of the most detailed studies of evolution in the wild ever carried out. Their adventures were chronicled 14 years ago by Jonathan Weiner in the Beak of the Finch, which won the Pulitzer Prize. But the Grants did not stop. They continued to observe the birds evolve, and make fascinating new discoveries. In 2002, I wrote an article on what they’d learned after some three decades of research. Six years have passed since then, and at today’s lecture I learned that they