I met Robert Schoch last year, the geologist who's been making academic archaeologists spit teeth for ages about Giza. He's finally proved, and I do mean proved, that the sphinx dates back quite a few thousand years earlier than the egyptologists have always said.
He's proved a minimum date of 7-5000bc but off the record he said that if the data currently being analysed pans out, it could push it back to about 15,000bc.

Love it!