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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...

A freight train or goods train is a group of freight cars (US) or goods wagons (UIC) hauled by a locomotive on a railway, ultimately transporting cargo between two points as part of the logistics chain. Trains may haul bulk, intermodal containers or specialized cars. Under the right circumstances, freight transport by rail is more economic and energy efficient than by road, especially when carried in bulk or over long distances...

Space Shuttle Discovery (Orbiter Vehicle Designation: OV-103) is one of the three currently operational orbiters in the Space Shuttle fleet of NASA, the space agency of the United States. (The other two are Atlantis and Endeavour.) When first flown in 1984, Discovery became the third operational orbiter, and is now the oldest orbiter in service. Discovery has performed both research and International Space Station (ISS) assembly missions...

Star Wars is an epic space opera franchise conceived by George Lucas. The first film in the franchise was originally released on May 25, 1977, by 20th Century Fox, and became a worldwide pop culture phenomenon, spawning two immediate sequels, released at three-year intervals. Sixteen years after the release of the trilogy's final film, the first in a new prequel trilogy of films was released, again released at three-year intervals, with the final film released on May 19, 2005...