kalibex
Dagobah Resident
Out of the 1,961 sightings recorded between 1951 and 2013, Thibault Laurent, Christine Thomas-Agnan, and Michaël Vaillant have 381 D-class observations, and their conclusions are provocative. They considered many variables surrounding these events. Population density being a key factor for their models. More people and more sightings mean more reports. But this is only the tip of the iceberg as Thibault and pals note a strong correspondence of D-class reports around nuclear power plants and toxic waste dumps. Also factoring into the mix are rural areas, forests, and wetlands.
_http://dailygrail.com/Alien-Nation/2015/10/UFO-Hotspots-Just-Got-Little-Hotter_