|Claims||Under certain circumstances water can retain a "memory" of solute particles after arbitrarily large dilution.|
|Related scientific disciplines||Chemistry, Medicine|
|Original proponents||Jacques Benveniste|
|Subsequent proponents||Madeleine Ennis
Water memory is the proposed ability of water to retain a memory of substances previously dissolved even after an arbitrary number of serial dilutions. It is claimed to be the mechanism by which homeopathic remedies work, even though they are diluted to the point that no single molecule of the original substance remains. Water memory defies conventional scientific understanding of physical chemistry knowledge and is not accepted by the scientific community. In 1988, Jacques Benveniste published a study supporting a water memory effect amid controversy in Nature, accompanied by an editorial by Nature's editor John Maddox urging readers to "suspend judgement" until the results could be replicated. In the years following publication, multiple supervised experiments were run by Benveniste's team, the United States Department of Defense, BBC's Horizon program, and other researchers, but no team has ever reproduced Benveniste's results in controlled conditions.
Benveniste was a French immunologist who sought to demonstrate the plausibility of homepathic remedies "independently of homeopathic interests" in a major scientific journal. To that end, Benveniste his team at Institut National de la Santé et de la Recherche Médicale (INSERM, French for National Institute of Health and Medical Research) diluted a solution of human antibodies in water to such a degree that there was virtually no possibility that a single molecule of the antibody remained in the water solution. Nonetheless, they reported, human basophils responded to the solutions just as though they had encountered the original antibody (part of the allergic reaction). The effect was reported only when the solution was shaken violently during dilution. Benveniste stated: "It's like agitating a car key in the river, going miles downstream, extracting a few drops of water, and then starting one's car with the water." At the time, Benveniste offered no theoretical explanation for the effect, which was later called "water memory" by a journalist reporting on the study.
While Benveniste's study demonstrated a mechanism by which homeopathic remedies could operate, the mechanism defied conventional scientific understanding[clarification needed] of physical chemistry knowledge. A paper about hydrogen bond dynamics is mentioned by some secondary sources  in connection to the implausibility of water memory.
Publication in Nature
Benveniste submitted his research to the prominent science journal Nature for publication. There was concern on the part of Nature's editorial oversight board that the material, if published, would lend credibility to homeopathic practitioners even if the effects were not replicable. There was equal concern that the research was simply wrong, given the changes that it would demand of the known laws of physics and chemistry. The editor of Nature, John Maddox, stated that, "Our minds were not so much closed as unready to change our whole view of how science is constructed." Rejecting the paper on any objective grounds was deemed unsupportable, as there were no methodological flaws apparent at the time.
In the end, a compromise was reached. The paper was published in Nature Vol. 333 on 30 June 1988, but it was accompanied with an editorial by Maddox that noted "There are good and particular reasons why prudent people should, for the time being, suspend judgment" and described some of the fundamental laws of chemistry and physics which it would violate, if shown to be true. Additionally, Maddox demanded that the experiments be re-run under the supervision of a hand-picked group of what became known as "ghostbusters", including Maddox, famed magician and paranormal researcher James Randi, and Walter W. Stewart, a physicist and freelance debunker at the U.S. National Institutes of Health.
Post-publication supervised experiments
Under supervision of Maddox and his team, Benveniste and his team of researchers followed the original study's procedure and produced similar results to the published data. Maddox, however, noted that during the procedure the experimenters were aware of which test tubes originally contained the antibodies and which did not. Benveniste's team then started a second, blinded experimental series with Maddox and his team in charge of the double-blinding: notebooks were photographed, the lab videotaped, and vials juggled and secretly coded. Randi even went so far as to wrap the labels in newspaper,seal them in an envelope, and then stick them on the ceiling so Benveniste and his team could not read them. The blinded experimental series showed no water memory effect.
Madox's team published a report on the supervised experiments in the very next issue (July 1988) of Nature. Maddox's team concluded "that there is no substantial basis for the claim that anti-IgE at high dilution (by factors as great as 10120) retains its biological effectiveness, and that the hypothesis that water can be imprinted with the memory of past solutes is as unnecessary as it is fanciful." Maddox's team initially speculated that someone in the lab "was playing a trick on Benveniste," but later concluded, "We believe the laboratory has fostered and then cherished a delusion about the interpretation of its data." Maddox also pointed out that two of Benveniste's researchers were being paid for by the French homeopathic company Boiron.
In a response letter published in the same July issue of Nature, Benveniste lashed out at Maddox and complained about the "ordeal" he endured at the hands of the Nature team, comparing it to "Salem witchhunts or McCarthy-like prosecutions." In both the Nature response and during a later episode of Quirks and Quarks, Benveniste especially complained about Stewart, who he stated acted as if they were all frauds and treated them with disdain, complaining about his "typical know-it-all attitude". In his Nature letter, Benveniste also implied that Randi was attempting to hoodwink the experimental run by doing magic tricks, "distracting the technician in charge of its supervision!" He was more apologetic on Quirks and Quarks, re-phrasing his mention of Randi to imply that he had kept the team amused with his tricks and that his presence was generally welcomed. He also pointed out that although it was true two of his team-members were being paid for by a homeopathic company, the same company had paid for Maddox's team's hotel bill.
Maddox was unapologetic, stating "I'm sorry we didn't find something more interesting." On the same Quirks and Quarks show he dismissed Benveniste's complaints, stating that because of the possibility that the results would be unduly promoted by the homeopathy community, an immediate re-test was necessary. In failing, the tests demonstrated that the initial results were likely due to the experimenter effect. He also pointed out that the entire test procedure that Benveniste later complained about was one that had been agreed upon in advance by all parties. It was only when the test then failed that Benveniste disputed its appropriateness.
The debate continued in the letters section of Nature for several issues before being ended by the editorial board. It continued in the French press for some time and in September Benveniste appeared on the British television discussion programme After Dark to debate the events live with Randi and others. For all of the arguing over the retests, it has done nothing to stop what Maddox worried about; even in the light of their failure they are still used to claim that the experiments "prove" that homeopathy works. One of Benveniste's co-authors on the Nature paper, Francis Beauvais, later stated that while unblinded experimental trials usually yielded "correct" results (i.e. ultradiluted samples were biologically active, controls were not), "the results of blinded samples were almost always at random and did not fit the expected results: some 'controls' were active and some 'active' samples were without effect on the biological system."
In the cold fusion or polywater controversies many scientists started replications immediately, because the underlying theories didn't go directly against scientific fundamental principles and could be accommodated with a few tweaks to those principles. But Benveniste's experiment went directly against several principles, causing most researchers to outright reject the results as errors or fabrication, with only a few researchers willing to perform replications or experiments that could validate or reject his hypotheses.
After the Nature controversy, Benveniste gained the public support of Brian Josephson, a Nobel laureate physicist with a reputation for openness to paranormal claims. Experiments continued along the same basic lines, culminating with a 1997 paper claiming the effect could be transmitted over phone lines. This was followed by two additional papers in 1999 and another on remote-transmission in 2000 by which time it was claimed that it could also be sent over the Internet.
Time magazine reported in 1999 that, in response to skepticism from physicist Robert Park, Josephson had challenged the American Physical Society (APS) to oversee a replication by Benveniste. This challenge was to be "a randomized double-blind test", of his claimed ability to transfer the characteristics of homeopathically diluted water over the Internet. The APS accepted the challenge and offered to cover the costs of the test. When he heard of this, Randi also offered to throw in the long-standing $1 million prize for any positive demonstration of the paranormal, to which Benveniste replied: "Fine to us." in his DigiBio NewsLetter. However, Randi later noted that Benveniste and Josephson did not follow up on their challenge, mocking their silence on the topic as if they were missing persons.
An independent test of the 2000 remote-transmission experiment was carried out in the USA by a team funded by the United States Department of Defense. Using the same experimental devices and setup as the Benveniste team, they failed to find any effect when running the experiment. Several "positive" results were noted, however, but only when a particular one of Benveniste's researchers was running the equipment. "We did not observe systematic influences such as pipetting differences, contamination, or violations in blinding or randomization that would explain these effects from the Benveniste investigator. However, our observations do not exclude these possibilities."
Benveniste admitted to having noticed this himself. "He stated that certain individuals consistently get digital effects and other individuals get no effects or block those effects."
Third-party attempts at replication of the Benveniste experiment have failed to produce positive results that could be independently replicated. In 1993, Nature published a paper describing a number of follow-up experiments that failed to find a similar effect, and an independent study published in Experientia in 1992 showed no effect. An international team led by Professor Madeleine Ennis of Queen's University of Belfast claimed in 1999 to have replicated the Benveniste results. Randi then forwarded the $1 million challenge to the BBC Horizon program to prove the "water memory" theory following Ennis's experimental procedure. In response, experiments were conducted with the Vice-President of the Royal Society, Professor John Enderby, overseeing the proceedings. The challenge ended with no memory effect observed by the Horizon team. For a piece on homeopathy, the ABC program 20/20 also attempted, unsuccessfully, to reproduce Ennis's results.
Other research on the subject of water memory published in 2005 "observe[d] hydrogen bond network dynamics more than one order of magnitude faster than seen in earlier studies...." This research showed that "liquid water essentially loses the memory of persistent correlations in its structure" within fifty millionths of a nanosecond.
- List of experimental errors and frauds in physics
- List of topics characterized as pseudoscience
- Pathological science
- Scientific misconduct
- Masaru Emoto
- Homeopathic dilutions
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