On my lap, I’ve got a set of school books that date from the 1850s to the 1890s. They belonged to various of my father’s family – my great-uncle, George Hume, who died long before I was born and studied Eaton’s Common School Arithmetic in Amesbury, MA in the late 19th century, 20 miles from where I would go to school 100 years later. The majority belonged to my great-grandfather, Edgar White, who studied latin and algebra in Jonesboro, Maine, and later went on to teach school in Cheshire, Connecticut, using the same books. My grandfather’s books were…