Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Within the past ten years, the amount of social networking sites available to the public has greatly increased as well as the number of adolescents using them. Several sources report a high proportion of adolescents who use social media: 73% of 12–17 year olds reported having at least one social networking profile; two-thirds (68%) of teens text every day, half (51%) visit social networking sites daily, and 11% send or receive tweets at least once every day. In fact, more than a third (34%) of teens visit their main social networking site several times a day. One in four (23%) teens are "heavy" social media users, meaning they use at least two different types of social media each and every day.
What percentage of teens say they text every day?
A: 68%

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Over subsequent centuries, many Presbyterian churches modified these prescriptions by introducing hymnody, instrumental accompaniment, and ceremonial vestments into worship. However, there is not one fixed "Presbyterian" worship style. Although there are set services for the "Lord's Day", one can find a service to be evangelical and even revivalist in tone (especially in some conservative denominations), or strongly liturgical, approximating the practices of Lutheranism or Anglicanism (especially where Scottish tradition is esteemed),[clarification needed] or semi-formal, allowing for a balance of hymns, preaching, and congregational participation (favored by probably most American Presbyterians). Most Presbyterian churches follow the traditional liturgical year and observe the traditional holidays, holy seasons, such as Advent, Christmas, Ash Wednesday, Holy Week, Easter, Pentecost, etc. They also make use of the appropriate seasonal liturgical colors, etc. Many, incorporate ancient liturgical prayers and responses into the communion services and follow a daily, seasonal, and festival lectionary. Other Presbyterians, however, such as the Reformed Presbyterians, would practice a cappella exclusive psalmody, as well as eschew the celebration of holy days.
Although Presbyterians do not observe holy seasons they do observe which holidays?
A: unanswerable

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Video data may be represented as a series of still image frames. The sequence of frames contains spatial and temporal redundancy that video compression algorithms attempt to eliminate or code in a smaller size. Similarities can be encoded by only storing differences between frames, or by using perceptual features of human vision. For example, small differences in color are more difficult to perceive than are changes in brightness. Compression algorithms can average a color across these similar areas to reduce space, in a manner similar to those used in JPEG image compression. Some of these methods are inherently lossy while others may preserve all relevant information from the original, uncompressed video.
What may be represented as a series of still image frames?
A: Video data

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Despite Laemmle's role as an innovator, he was an extremely cautious studio chief. Unlike rivals Adolph Zukor, William Fox, and Marcus Loew, Laemmle chose not to develop a theater chain. He also financed all of his own films, refusing to take on debt. This policy nearly bankrupted the studio when actor-director Erich von Stroheim insisted on excessively lavish production values for his films Blind Husbands (1919) and Foolish Wives (1922), but Universal shrewdly gained a return on some of the expenditure by launching a sensational ad campaign that attracted moviegoers. Character actor Lon Chaney became a drawing card for Universal in the 1920s, appearing steadily in dramas. His two biggest hits for Universal were The Hunchback of Notre Dame (1923) and The Phantom of the Opera (1925). During this period Laemmle entrusted most of the production policy decisions to Irving Thalberg. Thalberg had been Laemmle's personal secretary, and Laemmle was impressed by his cogent observations of how efficiently the studio could be operated. Promoted to studio chief, Thalberg was giving Universal's product a touch of class, but MGM's head of production Louis B. Mayer lured Thalberg away from Universal with a promise of better pay. Without his guidance Universal became a second-tier studio, and would remain so for several decades.
Who else decided not to develop a theater chain with Laemmle?
A:
unanswerable