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Out of Africa Professor Erik Trinkhaus explains how recent fossil findings in China could shed light on how our ancestors colonised the East. Doggy DNA Research into the genetic make up of man’s best friend has isolated a gene which plays a major role in determining the vast range of size differences amongst dog breeds. Geoff talks to biologist Nathan Sutter. No to Corn as a Biofuel Biologist Chris Somerville explains why he thinks corn is not suitable as a fuel crop. Perpetual Motion There’s no such thing as a free lunch in physics according to Mark Lewney. Dartsboard deductions Mathematicians claim to have worked out the ideal strategy to generate high scores in darts. Gareth Mitchell investigates.