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Geneticist and author Dr Adam Rutherford asks why it’s highly unlikely that there will be any white competitors in the final of the men’s 100m at this summer’s Olympics. Is there a genetic reason why the sport is dominated by black men - or are the reasons cultural? With the help of 5 live’s Nihal Arthanayake, Adam speaks to experts and to former sprint Darren Campbell, and looks into the scientific and historical reasons behind sporting success.