I've been watching Zahi Hawass in action, on an american reality TV show, Chasing Mummies. His nickname is 'Pharoah' and he is kindly and autocratic in turns. In one episode he was measuring the RH inside the Great Pyramid and, up near the top, it reached 80%. He shut it to visitors from then on. You couldn't imagine that happening in the UK. Every so often I would get a daft lad wanting to learn drystone walling. "Bring me stone", I would say. None of them lasted except for a handful of post grads, in a formal structure. I occasionally wonder how their ability to place stones has surfaced in their lives.