Modelling the needed population of tooth fairies

The posting on the Bad Science blog of articles from an issue of Homeopathy about the memory of water has let to quite a lot of critical appraisal of the science behind these articles.

My favourite quote from these discussions is from a comment on the Good Math blog regarding the modelling of dilution and succussion ('shaking' in homeopathy):

"Nobody models the needed population of tooth fairies".