One question which always bothered me as a kid who was interested in archaeology was why was it that ancient ruins were always found underground? Was the world getting bigger, in some way, that these ruins were being buried by the ever increasing size of the Earth? While you can probably get my youthful logic, this isn’t the case. One of the main reasons is that cities are simply built on top of each other, with each successive wave of construction simply building on top of the rubble under...