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Santa Maria della Concezione dei Cappuccini, or Our Lady the Conception the Capuchins, is a church in Rome, Italy, commissioned by Pope Urban VIII, whose brother, Antonio Barberini, was a Capuchin friar. It is located at Via Veneto, close to Piazza Barberini. The crypt is located just under Santa Maria della Concezione, a church commissioned by Pope Urban VIII in 1626...

In aerodynamics, the sound barrier usually refers to the point at which an aircraft moves from transonic to supersonic speed. The term came into use during World War II when a number aircraft started to encounter the effects compressibility, a collection several unrelated aerodynamic effects. By the 1950s, new aircraft designs started to routinely "break" the sound barrier...

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...