I've just finished Robert Sapolsky's Behave: the biology of humans at our best and worst.  It's a massive book, covering the development of our brains and our behaviour from the moment of conception, set firmly in the context of long-run evolutionary trends.  The early parts were tough going for a scientific illiterate, notwithstanding Sapolsky's breezy humour,  but if you persevere there are huge numbers of plums in this rich pudding. Sapolsky's overall message is (and I quote), "It's complicated."   Life, development and behaviour are all a matter of a vast number of interactions that take place in a wide variety of contexts.  We may have learnt a lot, but at…