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World is a common name for the whole of human civilization, specifically human experience, history, or the human condition in general, worldwide, i.e. anywhere on Earth. In a philosophical context it may refer to: (1) the whole of the physical Universe, or (2) an ontological world (world disclosure). In a theological context, world usually refers to the material or the profane sphere, as opposed to the celestial, spiritual, transcendent or sacred...

In infrared photography, the film or image sensor used is sensitive to infrared light. The part of the spectrum used is referred to as near-infrared to distinguish it from far-infrared, which is the domain of thermal imaging. Wavelengths used for photography range from about 700 nm to about 900 nm. Usually an "infrared filter" is used; this lets infrared (IR) light pass through to the camera, but blocks all or most of the visible light spectrum (the filter thus looks black or deep red)...

The Berlin Zoological Garden (German: Zoologischer Garten Berlin) is the oldest and best known zoo in Germany. Opened in 1844 it covers 34 hectares (84 acres) and is located in Berlin's Tiergarten. With almost 1,500 different species and around 16,000 animals the zoo presents the most comprehensive collection of species in the world. The zoo and its aquarium had 3 million visitors in 2009. It is considered to be the most visited zoo in Europe and one of the most popular worldwide...

A POTD is an acronym for "Photo of the Day", "Picture of the Day", "Post of the Day" or "Poll of the Day". It is a term most commonly used by online digital photography communities as an honor to outstanding photos that are selected daily from among that community's membership. They can either be tagged as POTD or displayed in a special page on that site...