Three water-filled maars in the Eifel, Germany (Gemündener Maar, Weinfelder Maar, Schalkenmehrener Maar). Created by volcanic activity, maars are also found in other parts of Europe and on other continents, but Eifel-Maars are the classic example worldwide. Credit: Martin Schildgen / Wikimedia Commons Scientists have discovered new evidence for active […]

Arctic Kola peninsula The Norwegian Intelligence Service says GPS signal disruption as seen during major NATO drills in Norway last year “is of particular concern” for the military and “is also a threat to civil aviation in peacetime.” The intelligence agency said Monday in its annual report that the signal jamming “represents […]