Nice science reporting here on what appears to be a bit of a scientific mystery. The Author does a good job of letting the scientists and researchers speak for themselves without interposing her own views. Informative, and the comments, particularly those of a seemingly wildly speculative nature, from those studying the matter make for interesting, even entertaining, reading. Good links provide context and a plethora of further reading for the amateur sleuths among us. Well done and a worthwhile investment of one's time. Four stars!