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With the news that a baby has been ‘cured’ of HIV we look at what the numbers tell us about the epidemic. Ruth Alexander looks at the changes in the way that the disease has been measured and asks can the progress be attributed to better treatment and prevention programmes or is there another story in the numbers? Ron Brookmeyer, Professor of Biostatistics at the University of California helps look at the figures. Also the Dow Jones hit an all-time high this week so is it party time for investors? Justin Lahart from the Wall Street Journal helps us out. Photo: Science Photo Library