Not a single piece of material culture - not a single object - has been found at Giza that can be interpreted to come from a lost civilization.
I do not believe we can blame genetics for adultery, homosexuality, dishonesty and other character flaws.
The more determinedly I exist, as myself, within the conditions of the time, the more clearly I shall hear the language of the past, the nearer I shall feel the glow of its life.