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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...

Frank Hurley’s famous early color photographs of Sir Ernest Shackleton’s ill-fated ‘Endurance’ voyage, as part of the British Imperial Trans-Antarctic Expedition, 1914-1917. Hurley was the official photographer on the expedition. Early in 1915, their ship ‘Endurance’ became inexorably trapped in the Antarctic ice. Hurley managed to salvage the photographic plates by diving into mushy ice-water inside the sinking ship in October 1915...

A shadow is an area where direct light from a light source cannot reach due to obstruction by an object. It occupies all of the space behind an opaque object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or reverse projection of the object blocking the light.The sun causes many objects to have shadows and at certain times of the day, when the sun is at certain hights, the length of shadows change...