An entire issue of the journal Homeopathy has been devoted to speculations about the memory of water.
The link to this issue is http://www.sciencedirect.com/science/journal/14754916 , but sadly you can’t read the papers without a subscription to the journal (and believe me, they aren’t worth paying much for). With luck, Ben Goldacre will be able to post the full text at badscience.net.
The first paper, The Memory of Water: a scientific heresy?, is by Peter Fisher, the editor of the journal. Peter Fisher, Homeopathic physician to the Queen, is a person whose name appears often in the original IMPROBABLE SCIENCE page, is not at unreasonable man, by the standards of homeopaths. He condemned roundly the recommendation by less-educated homeopaths of homeopathic pills for prevention of malaria. And he did agree with me that homeopathy had not got sufficient scientific basis to justify a BSc degree.
Peter Fisher’s introduction to the issue admits quite frankly that there is no strong evidence for water having memory of the sort that would be needed to explain the claims of homeopaths. There is nothing that explains the bizarre proposition that the medicine gets stronger the more you dilute it. There is nothing that explains the equally bizarre proposition that the water ‘remembers’ only the ingredient that you add, but conveniently forgets the countless other substances that it has encountered in the oceans and the bodies of the vast numbers of animals and plants through which it has passed.
Fisher is also sufficiently honest to include in his special issue a contribution “Can water possibly have a memory? A sceptical view“, written by JosÃ© Teixeira (a physicist from the European Neutron scattering lab -see some of his publications).
To summarize this short overview, one can say that water is a ‘complex’ liquid with many fascinating, sometimes unique aspects. Except for some academic aspects concerning supercooled water, the structure of the liquid is well known. In particular, it is certain that:
(b) The longest life of any structure observed in liquid water is of the order of 1 ps [one millionth of a millionth of a second]
This is why any interpretation calling for ‘memory’.effects in pure water must be totally excluded.