A branch of zoology that involves the study of mites and ticks: Mrs. Smith was absolutely amazed at the information she read about acarology, and thought that she should clean and purify her house again!

"There are thousands and thousands of sub-visible dust mites in every home, regardless of how often it is cleaned. It sounds unpleasant, but is quite normal."

"Our houses are hosts to these creatures which are ultra-tiny (so small they were only first discovered in 1965) which live in human carpets, in our beds, on our food, floating in the air, in fact, they are omnipresent."