"There are many dark chapters in mankind's history ranging from transatlantic slave trade to holocaust to dropping of nuclear bombs. While most are brought up to serve as a reminder of human misdeeds -- one sordid tale often goes unnoticed -- the presence of 'human zoos'. Up until the late 1950s, white Europeans could go and see people from other ethnic backgrounds exhibited in cages for entertainment purposes during trade fairs. Akin to the modern zoos where animals are exhibited, humans, that too of a certain complexion were paraded."