In the early 1980s, Benveniste took on a new member of staff - a young medical doctor with a side-interest in homeopathy. "He asked me if he could try out some homeopathic preparations on my allergy test", Benveniste recalled, "and I remember distinctly saying 'OK, but all you will be testing is water'".
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But when Benveniste's staff member tried a homeopathically diluted allergen on his allergy test, the test showed positive - it produced an allergic response as powerful as the original full-strength allergen. Intrigued but cautious, Benveniste ordered a two-year long series of retests, but the same results kept on recurring. "I was flabbergasted," he said. "My allergy test is highly reliable and yet it was apparently responding to mere water; I felt I was setting foot into an unknown world." Following accepted scientific practice, he then asked five other laboratories to try to replicate his findings. Once again, they obtained the same astonishing results. "Even after more than a billion-fold dilution, water was behaving as if it could remember the molecules it had been originally exposed to," he concluded.