When Anglo-Saxons first arrived in Britain 1,600 years ago, they created an apartheid-like society that oppressed the native Britons and wiped out almost all of the British gene pool, according to a new study. By treating Britons like slaves and imposing strict rules, the small band of Anglo-Saxons -- who had come from what is now Germany, Denmark, and the Netherlands -- quickly dominated the country, leaving a legacy of Germanic genes and the English language, both of which still dominate Britain today. The new theory helps explain historical, archaeological, and genetic evidence that until now had seemed contradictory, including...