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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...

Railway modelling (UK, Australia, Ireland and Canada) or model railroading (US and Canada) is a hobby in which rail transport systems are modelled at a reduced scale. The scale models include locomotives, rolling stock, streetcars, tracks, signalling, and roads, buildings, vehicles, model figures, lights, and features such as streams, hills and canyons. The earliest model railways were the 'carpet railways' in the 1840s. Electric trains appeared around the turn of the 20th century...

A biscuit ( /ˈbɪskɨt/) is a baked, edible, and commonly flour-based product. The term is used to apply to two distinctly different products in North America and the Commonwealth Nations. In the United States it is a small, soft, leavened bread, somewhat similar to a scone. In Commonwealth English, it is a small and hard, often sweet, baked product that would be called either a cookie or a cracker in the United States and Canada...