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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 smile is a facial expression formed by flexing the muscles near both ends of the mouth. The smile can also be found around the eyes. Among humans, it is an expression denoting pleasure, joy, happiness, or amusement, but can also be an involuntary expression of anxiety, in which case it is known as a grimace. Smiling is something that is understood by everyone despite culture, race, or religion; it is internationally known...

Perini Navi is an Italian shipyard based in Viareggio, Italy, province of Tuscany. Ship maintenance now occurs at the Ligurian port of La Spezia. Founded by Fabio Perini in the 1980s, it builds large (20m-60m), luxury sailing yachts, mainly of ketch design. The company is merged with the historic Picchiotti shipyard. The ship hulls are made in Turkey and the rest of the building occurs in Italy...

Fog is a collection of water droplets or ice crystals suspended in the air at or near the Earth's surface. While fog is a type of a cloud, the term "fog" is typically distinguished from the more generic term "cloud" in that fog is low-lying, and the moisture in the fog is often generated locally (such as from a nearby body of water, like a lake or the ocean, or from nearby moist ground or marshes)...