In 1798, young French general Napoleon Bonaparte entered Egypt with a veteran army and a specialist group of savants--scientists, engineers, and artists--his aim being not just conquest, but the rediscovery of the lost Nile kingdom. A year later, in the ruins of an old fort in the small port of Rosetta, the savants made a startling discovery: a large, flat stone, inscribed in Greek, demotic Egyptian, and ancient hieroglyphics. This was the Rosetta...