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World War II, or the Second World War (often abbreviated as WWII or WW2), was a global military conflict lasting from 1939 to 1945 which involved most of the world's nations, including all of the great powers, organised into two opposing military alliances: the Allies and the Axis. It was the most widespread war in history, with more than 100 million military personnel mobilised...

A dirty thunderstorm (also, Volcanic lightning) is a weather phenomenon that occurs when lightning is produced in a volcanic plume. A famous image of the phenomenon was photographed by Carlos Gutierrez and occurred in Chile above the Chaiten Volcano. It circulated widely on the internet. Other instances have been reported above Alaska's Mount Augustine volcano, and Iceland's Eyjafjallajökull volcano...

Canvas hotel is located in Telemark County in Southern Norway. It is placed on an island in a small lake, 460 metres above sea level. The surrounding hills go as high as 800m. • Trails Small cairns and rubber stripes on granite are their track to follow. Swamps and canyons are crossed on north shore, but their focus has been on leaving as little impact on the terrain as possible. As much as 70% of the trails is running on solid granite...

Autumn or fall is one of the four temperate seasons. Autumn marks the transition from summer into winter usually in March (Southern Hemisphere) or September (Northern Hemisphere) when the arrival of night becomes noticeably earlier. The equinoxes might be expected to be in the middle of their respective seasons, but temperature lag (caused by the thermal latency of the ground and sea) means that seasons appear later than dates calculated from a purely astronomical perspective...