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Gold has long been a symbol of wealth and power, but it also has spiritual significance, and today it’s even used to treat cancer. Matthew Taylor talks about the many values of gold with Kwasi Kwarteng, a member of Parliament in the UK and author of War and Gold; Maria Alicia Uribe, who is director of the Gold Museum in Colombia; and gold nano-particle scientist Nicholas Kotov. Photo: Gold bars, Credit: Science Photo Library