Just after 4000 BCE, a group of settlers took up residence in the Orkney Islands in Northern Scotland. They established the earliest family farms of the United Kingdom, and later the UK's first known farming village, Skara Brae. This same group later erected some of the earliest and finest megalithic structures in the British Isles - centuries before Dynastic Egypt. There is no academic consensus regarding who these first Orcadian farmers were, or...