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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...

The hot air balloon is the oldest successful human-carrying flight technology and is a subset of balloon aircraft. On Nov 21, 1783, in Paris, France, the first untethered manned flight was made by Jean-François Pilâtre de Rozier and François Laurent d'Arlandes in a hot air balloon created on Dec 14, 1782 by the Montgolfier brothers. Recently, balloon envelopes have been made in all kinds of shapes, such as hot dogs, rocket ships, and the shapes of commercial products...

The Batcycle for the 2008 superhero film The Dark Knight (directed by Christopher Nolan) is called the Batpod and its mock-up was done by Nolan and later designed by Nathan Crowley, who designed the Tumbler for Batman Begins (2005). The bike has 20" front and rear tires (the Tumbler's front wheels), and is powered by a high-performance, water-cooled, single-cylinder engine - geared toward the lower end for faster acceleration and with no exhaust pipes...

In the Christian religion, a church building is a building or structure whose primary purpose is to facilitate the meeting of a Christian Church. Originally, Jewish Christians met in synagogues, such as the Cenacle, and in one another's homes, known as house churches...