It is a world wide phenomenon with the most regular occurrences from North America,
Speculations are that it has come from Spiders or another type of silk-spinning insect, and even UFO’s as it has often been associated with UFO sightings. Because of its sensitive nature, it has been difficult to collect, and to analyse as it is subject to contamination from car exhaust fumes, and even human contact, which could skew the chemical results.
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