By decoding ancient hieroglyphic texts, Jean-François Champollion gave voice to an enigmatic civilization, but behind his legendary feat is a mysterious brother who made it possible. The recent discovery of correspondence between Jean-François Champollion and his brother Jacques-Joseph now allows us to fully understand how a young, self-taught genius was able to make one of the most important discoveries of the 19th century. Without the ingenuity and unfailing support of his older brother, Jean-...