good material thanks http://www.iobm.co.uk/welcome/efficiency/ revatio vs sildenafil  The differences in diet point to a significant gap in social status between those buried with and without their heads, Naumann says. Perhaps those who dined on meat or dairy products were rich or powerful; perhaps they were a religious elite. A DNA analysis showed that most of those buried in graves together probably weren't close kin, at least through their mothers, the researchers say. The mistreatment of the bodies, the DNA results and the dietary differences led the scientists to think that the headless bodies are most likely slaves who met premature ends to be interred with their masters.