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The desire for vengeance \\u2013 to harm those who\\u2019ve harmed you - is part of human nature. Whether it\\u2019s getting your own back on a cheating partner or settling a score with a childhood bully, many of us have considered retribution against the person who\\u2019s done us wrong. Yet often we decide not to act on that instinct.

So what motivates someone to take revenge and why did this kind of aggressive behaviour evolve? Mike Williams talks to a perpetrator who found it sweet and hears the tragic story of a victim of impossibly cruel revenge.

Contributors:\\n\\u201cAnnie\\u201d, who took revenge\\nMichael McCullough, Professor of Psychology, Miami University \\nDr David Chester, Assistant Professor of Psychology, Virginia Commonwealth University\\nSarah Heatley, mother of Nina and Jack \\nPhilippe Sands QC, International Human Rights lawyer and author, East West Street \\nProfessor Jack Levin, Co-Director, Brudnick Center on Violence and Conflict, Northeastern University, Boston, Massachusetts

Presenter: Mike Williams\\nProducer: Sally Abrahams

(Photo: White Voodoo doll with red pins on cork background. Credit: Shutterstock/Scott Rothstein)