Over the past day or two I have been reading John Fowles' documentary book The Enigma of Stonehenge . I got it because I was interested in John Fowles and not because I was particularly interested in Stonehenge, but it is a fascinating story. The familiar ring of giant stones was built by my ancestors in several phases over about 1300 years from 2800bc onwards. No one is quite sure what it was used for, but its construction was made possible when one neolithic group conquered and enslaved another, and stole their technologies and some of the big boulders they had put centuries of work into assembling at Avebury. It seems likely that amongst the uses to which Stonehenge was put was human sacrifice, a practice my relatives were apparently quite keen on back when they were painting themselves blue. So there in my ancestry is murder and warfare, enslavement, and the sacrifice of children. I've got to assume that the people who did this were not too dissimilar from me in their genet...