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Are you more chimp or Neanderthal? We're talking about DNA, not spirit animals. We often hear scientists talking about how we are related but what's the difference between 96% similarity and sharing 20% of our DNA, and do some of us literally have pieces of Neanderthal within us? Tim Harford speaks to Professor Peter Donnelly to help answer this genetic generation game. First broadcast on More or Less, 16 September 2018.