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The debate between nature and nurture is as old as the hills - is genetics or cultural conditioning the key to understanding human evolution? Stephen Sackur speaks to Joseph Henrich, a Harvard professor whose fascination with human evolution and anthropology has brought him to a radical conclusions. Western societies preoccupied with the individual not the collective are "weird" and the cultural power of the west has skewed our view of what is normal. How much do we humans really have in common?