Bad Luck and Cancer

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Most cancers are caused by 'bad luck' according to reports of a new study. But, actually, the study doesn't say that. Tim Harford finds out what the research really tells us about the causes of cancer, speaking to PZ Myers, a biologist and associate professor at the University of Minnesota, Morris, in the United States and Professor George Davey-Smith, clinical epidemiologist at Bristol University in the UK. (Photo: Dividing breast cancer cell. Credit: Science Photo Library)