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Cancer and antibiotics, the final push against polio, and rats used to fight tuberculosis. A number of studies have found a link between breast cancer and heavy use of antibiotics. More research is being done to find out why. Also a report on the World Health Organisation's final push to eradicate polio. Why some migrants are more likely to have schizophrenia and how rats are helping sniff out tuberculosis. Presenter: Hassan Arouni.