“For a long time it was assumed that anything so miraculously energetic as radioactivity must be beneficial. For years, manufacturers of toothpaste and laxatives put radioactive thorium in their products, and at least until the late 1920s the Glen Springs Hotel in the Finger Lakes region of New York (and doubtless others as well) featured with pride the therapeutic effects of its ‘Radio-active mineral springs27’. It wasn’t banned in consumer products until 193828. By this time it was much too late for Mme Curie, who died of leukaemia in 1934. Radiation, in fact, is so pernicious and long-lasting that even now her papers from the 1890s – even her cookbooks – are too dangerous to handle. Her lab books are kept in lead-lined boxes29 and those who wish to see them must don protective clothing.”