Benjamin Franklin is arguably the most famous American ever. His youngest sister Jane is mostly lost to history. But Harvard historian Jill Lepore found her in the letters she and her brother exchanged over their long lives. They were called Benny and Jenny and Benny wrote more letters to Jenny than he did to anyone else. Most of his survive; many of hers do not. Lepore’s new book got an excellent review in The New York Times recently and it’s already nominated for a National Book Award in nonfiction. Here & Now producer Alex Ashlock spoke to Lepore about the book....