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A fairy survey. Three, actually, based on experience. Thanks to Anomalist for link. Yes, I took one of the surveys; of course I did!
Survey - Fairyist: The Fairy Census is an attempt to gather, scientifically, the details of as many fairy sightings from the last century as possible and to measure, in an associated survey, contemporary attitudes to fairies. The census was inspired by an earlier fairy census carried out by Marjorie Johnson and Alasdair Alpin MacGregor in 1955/1956, a census that was published in 2014.