The Egyptians have taught us many things. They were excellent farmers. They knew all about irrigation. They built temples which were afterwards copied by the Greeks and which served as the earliest models for the churches in which we worship nowadays. They had invented a calendar which proved such a useful instrument for the purpose of measuring time that it has survived with a few changes until today. But most important of all, the Egyptians had learned how to preserve speech for the benefit of future generations. They had invented the art of writing.