Water memory

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*[http://scienceblogs.com/insolence/2006/06/your_friday_dose_of_woo_its_no.php Science Blogs - Your Friday Dose of Woo: It's not just homeopathy, it's quantum homeopathy!]
 
*[http://scienceblogs.com/insolence/2006/06/your_friday_dose_of_woo_its_no.php Science Blogs - Your Friday Dose of Woo: It's not just homeopathy, it's quantum homeopathy!]
 
*[http://arstechnica.com/articles/culture/the-pseudoscience-behind-homeopathy.ars Ars Technica - Diluting the scientific method: Ars looks at homeopathy]
 
*[http://arstechnica.com/articles/culture/the-pseudoscience-behind-homeopathy.ars Ars Technica - Diluting the scientific method: Ars looks at homeopathy]
 +
*[[Wikipedia]] on [[wp:Water memory|water memory]] - A decent coverage of the study published in ''Nature'' towards the end of the 1980s.
  
 
==Footnotes==
 
==Footnotes==

Revision as of 09:50, 6 November 2009

Pseudoscience Alert
This topic is a pseudoscience, and is not accepted by the scientific community as a valid discipline.
Although it may use scientific terminology, it does not use scientific methodology.
Remember: just because it sounds right doesn't mean it's actually right.


Water memory is a concept central to homeopathy. Due to the nature of the dilutions in a homeopathic preparation, no molecule of any active ingredient remains in the final product. To get around this fact homeopaths fall back onto the idea that the solution somehow retains a "memory" of the solute. Although it is possible to argue that only proof of efficacy in homeopathic preparations is important, water memory has become an essential element for anyone trying to offer up rationalizations for a mechanism of action. To highlight its importance the homeopath apologist's journal Homeopathy recently devoted a whole issue to water memory.[1]

This idea takes many forms, each of which is less plausible than the last.

Contents

Basics

The central principle of Homeopathy is that like cures like. So homeopaths seek out dangerous herbs and other ingredients that produce symptoms of disease (such as nightshade, arsenic, and strychnine) and use these in their preparations. Since this would normally kill the patient the homeopath uses a series of dilution procedures to dilute the solution so much that any given sample will not contain any of the original ingredients. While most people realize that diluting decreases potency the homeopath claims the exact opposite - that the more diluted the preparation is the stronger it is. This potency increasing dilution also magically removes the side effects of the original poison.

Homeopaths have failed to prove the efficacy of their treatments after many experimental attempts. Given the complete and utter failure of experimental evidence many have turned to trying to create mechanistic explanations for how homeopathy could work. These "proof of principle" ideas revolve around finding an explanation for how diluting a solute can increase its effect. The current vogue idea is "water memory". The homeopath believes that their dilution process somehow transfers the properties of the solute to the water molecules themselves, then those molecules of water transfer it to new water and on and on. They propose this as the explanation for the a priori belief that diluting increases potency.

Homeopaths, true to form, have not really tried to prove that there even is such a thing as water memory. One cogent example of this is that James Randi has offered his million dollar paranormal challenge money to anyone that can prove water memory exists. No major homeopath practitioner or company has taken him up on the offer. However, recently one researcher claimed to have proved water memory does exist. Horizon (a program on the BBC) did an on air test replicating that researcher's work with James Randi to attempt to win the prize. The replication failed completely.[2]

Since the starting premise in most research on water memory is that it is a fact, an explanation must be sought. There are no analogous situations in the natural world, so unique lines of reasoning have been developed to explain a phenomenon that has never been proven to exist. With no actual data on water memory or how it behaves (since they haven't even proved it exists!) researchers can make up whatever they feel like as long as it sounds nice and not have to be worried about testing or making predictions. This is a big reason why this fraud is the epitome of pseudoscience.

Ideas presented by homeopaths

There are many odd ideas presented by homeopaths to try to explain the mechanism behind the phenomenon of water memory. Since water memory has not yet be proven to exist, the hypotheses are a bit premature. Examples include:

  • The silica hypothesis[3]
  • Active oxygen[4]
  • Quantum homeopathy[4]

Modeling water memory

One of the most clear cut examples of how water memory researchers work from assuming their conclusion is in the realm of mathematical modeling. A recent example was published in the aforementioned water memory issue of Homeopathy.[5] The author of this paper took a list of assumed properties of water memory based around assumptions of homeopathy and then constructed a mathematical model that described these assumptions. In the paper the author has no physical experimentation in which to ground his model and no logical constraints other than "it makes the equation do what I want" for most of his manipulations. Exponentials and terms are randomly dropped into the model with the only explanation being that they were required to make the math work. Mark Chu-Carroll of scienceblogs has a full refutation of the work at his site. [6]

The amazing thing about this is that this is considered cutting-edge research. There is no empirical grounding or logical constraints at all. This is terrible science, yet it's the best they have to offer. It is no wonder that so few people take this stuff seriously. It's completely baffling how anyone can.

Problems with water memory

Thermodynamics of water memory

According to thermodynamics, the thermodynamic functions (enthalpy, entropy, etc.) of a substance are determined only by the current state of the system, in terms of its pressure, temperature, volume, etc. Included in this is the distribution of velocities and internal vibrations and rotations. Thermodynamics has shown that how one reaches these states is independent of the path to the state; that is, there is no "memory" of former temperatures, pressures, etc. or dissolved substances. If water did have a memory, it would be an example of a Nobel prize winning concept, as it would violate current thermodynamic concepts.

There are such forms of substances that are thermodynamically unstable or "metastable" (such as supersaturated solutions or allotropes of elements) that exist that are prevented kinetically from approaching thermodynamic stability because of a lack of a pathway. However, water has relatively weak hydrogen bonding as intermolecular forces (relative to covalent bonds) that are easily overcome at room temperature. Once a solute is removed from the water, the water will rapidly come to equilibrium and all evidence that the solute was ever in the water will be gone.

Various physical properties of water can be altered by small amounts of dissolved substances; these properties are called "colligative properties," and have been explored in great detail by physical chemists. Hence, the purity of the water, including dissolved gases, is paramount in determining physical properties. There are clusters of water molecules as well as hydronium ions, hydroxide ions and associated hydrogen bonded species of these ions; however, there is no evidence that these exist over macroscopic scales as suggested by the water memory enthusiasts. Water memory also likely violates the principle of microscopic reversibility.

Tap water of death

One of the interesting questions with water memory is why billions of people world wide drinking out of natural and tap sources of water are not dropping dead of overdoses. One environmental watchdog group has documented over 500 chemicals in an average glass of tap water, many of which are used in homeopathic treatments.[7] The EPA of course sets maximum concentration for this chemicals in water, and over time the maximum concentration has decreased considerably. Many people consider that as a way of making tap water safer to drink, but to the homeopath that's actually making it worse! More dilution equals stronger effect.

If water truly had a memory then city tap water would be the most dangerous substance on the planet. Most homeopaths seem to ignore this consequence of their theory or offer post-hoc rationalizations such as succession being needed to "potentiate the solution." However, many others see this as a prime opportunity to make even more money. Various products and magic cleansing waters are sold over the internet to eliminate these toxins with prices exceeding a thousand dollars.[8][9]

The far more parsimonious explanation is that water does not have a memory and that the well established physical laws involving dilutions are true. But this will never stop a True Believer.

Summary

The completely unscientific nature of these hypotheses has been explored elsewhere, but they have a number of flaws in common. All start with the assumption that the phenomenon in question actually exists, and moves from there to try to find a reason why. None of these reasons have any scientific plausibility. Furthermore, the experiments fail to provide adequate control and rigorous determinations of purity, and fail to assess error in the measurements. The proponents also give possible explanations of the phenomenon without any link between their "data" and the proposed physical explanations. Explanations include increased or decreased levels of hydrogen bonding; macroscopic clustering of water molecules; and polymerization (which is impossible).

External links

Footnotes

  1. Homeopathy. Volume 96, Issue 3 pp. 141-230 (July 2007).The Memory of Water
  2. Article about the Horizon show
  3. David J. Anick and John A. Ives. The silica hypothesis for homeopathy: physical chemistry. Homeopathy. Volume 96, Issue 3, July 2007, Pages 189-195 The Memory of Water
  4. 4.0 4.1 Vladimir L. Voeikov. The possible role of active oxygen in the Memory of Water. Ibid Pages 196-201.
  5. David J. Anick. The octave potencies convention: a mathematical model of dilution and succussion. Volume 96, Issue 3, July 2007, Pages 202-208 The Memory of Water.
  6. Mark Chu-Carroll's refutation of homeopathic math
  7. National tap water quality database
  8. Magic water woo machine
  9. Magic cleansing water ECH20!
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