here's a couple health related "linx" which may be useful... The complicated truth about a cat’s purr “Purrs at a frequency of 25-100Hz correspond with established healing frequencies in therapeutic medicine for humans," Weitzman says. "Bone responds to 25-50Hz and skin and soft tissues to around 100Hz according to researchers." This Website Is Literally Just a Cat Purring Forever "A website called Purrli takes the latter idea even further: it puts a feline friend in your browser, so that cat-lovers can keep the soothing sound of purring in their ears at all times." ...or not.