Scientists have uncovered the earliest evidence that Stone Age man lived in nuclear families. An international team of researchers, including experts from the University of Bristol, used DNA testing to date the remains from four burial sites discovered in Germany in 2005. The 4,600-year-old graves contained groups of adults and children buried facing each other, which was an unusual practice in Neolithic culture. A group burial of a 4,600-year-old nuclear family, was discovered in Germany One of the graves contained a female, a male and two children and the analysis revealed the researchers were a mother, father and their two...