In July 1988 an unusual paper was published in the scientific journal Nature. It offered experimental evidence for a basic tenet of homeopathy: that a substance can still have a biological effect even when it is extremely dilute. So unorthodox was the claim made by Jacques Benveniste , a French immunologist, that Nature's editor took a magician and an expert in scientific fraud to Paris to investigate Benveniste's laboratory.
Professor Lewis Wolpert reopens the case of the 'water with a memory'. Producer NICHOLAS MORGAN