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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 Blue Angels is the United States Navy's flight demonstration squadron. It was formed in 1946, making it the second oldest formal flying aerobatic team (flying under the same name) in the world, after the French Patrouille de France formed in 1931. The Blue Angels' six demonstration pilots fly the F/A-18 Hornet in more than 70 shows at 34 locations throughout the United States each year, where they still employ many of the same practices and techniques used in their aerial displays in 1946...

A shipwreck is what remains of a ship that has wrecked, either sunk or beached. Whatever the cause, a sunken ship or a wrecked ship is a physical example of the event: this explains why the two concepts are often overlapping in English. A shipwreck could be called a wreck if the structure is still recognizable or a wreckage if it is not recognizable anymore. The United Nations estimates that there are more than 3 million shipwrecks on the ocean floor...