It is a generally accepted fact that genetically human beings are 99.9% identical. "When researchers completed the final analysis of the Human Genome Project in April 2003, they confirmed that the 3 billion base pairs of genetic letters in humans were 99.9% identical in every person. It also meant that individuals are on average, 0.1 percent different genetically from every other person on the planet." (Source: National Human Genome Research Institute, NIH)