For years, mainstream scientists have said there are no real racial
differences among people. Race is purely a "social construct" -- in other
words, it's imaginary, some have argued.

But two new studies raise doubts about a key calculation on which this
argument rests. This calculation, often cited publicly by world-renowned
geneticists, is that all humans are more than 99.9 percent genetically
identical.

http://www.world-science.net/exclusives/040908_racefrm