So what is gravity? A typical definition of gravity is that it is a force. It causes an attraction between two masses. According to this definition, anything that has mass exerts a force. Any object exerts gravity on other objects. It does not matter how small it is, it has gravity. The more matter an object has, the more gravity it has. Your pencil has a tiny bit of gravity, but far too little to notice. What about a planet? It would have a lot of gravity. An objects gravity exerts a pull on other objects. Friction only occurs between objects that are touching. Gravity can act between objects that are not touching. In fact, gravity can act over very long distances. Where else can you feel gravity?
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Answer: Do all objects exert gravity?

Charlie Y. Reader is a 35-year-old theatrical agent in New York , living a seemingly idyllic life as a bachelor . Numerous women ( among them Poppy , Helen , and Jessica come and go , cleaning and cooking for him . Charlie 's best friend since kindergarten , Joe McCall , who has a wife named Ethel and children in Indianapolis , comes to New York for a stay at Charlie 's apartment , claiming that the excitement is gone from his 11-year marriage and that he wants to leave his wife . Joe envies and is amazed by Charlie 's parade of girlfriends , while Charlie professes admiration for Joe 's married life and family . At an audition , Charlie meets singer-actress Julie Gillis . She has her life planned to a tight schedule , determined to marry and retire from performing to a life of child-rearing by 22 . Although at first she wards off Charlie 's advances , she comes to see him as the ideal man for her plans . Julie demands that Charlie stop seeing other women . Charlie balks , but he begins to fall in love with her . Joe starts keeping company with Sylvia Crewes , a sophisticated classical musician and a typically neglected lover of Charlie 's . Sylvia is approaching 33 and desires marriage as much as the younger Julie does . One day , annoyed by Julie and possibly jealous of Joe 's attentions , Charlie blurts out a proposal of marriage to Sylvia . She is thrilled , only to discover the morning after their engagement party that he has proposed to Julie as well . Joe confesses his love to Sylvia and asks her to marry him .
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Answer: How old is Joe McCall's best friend?

Dam Good Luck: From the beginning, Las Vegas was built to serve travelers. The railroad needed a way station, and Las Vegas was the place. Growth continued for ten years, and by 1915 the town had telephones, round-the-clock electricity, and a growing populationmany of whom worked in the railroad repair shop. But such heady progress would soon come to a halt. The growing competition in rail transport resulted in Union Pacific buying the Los AngelesSalt Lake line. Union Pacific then consolidated its operations, eliminating the Las Vegas repair facility. Additionally, Las Vegas had been made a part of Nevada's new Clark County in 1909, a year when the legislature also outlawed gambling. These unfortunate circumstances threatened to relegate Las Vegas to the status of a small desert community that could no longer support its 3000 residents. But the southwest's growing need for water, combined with Las Vegas's fortuitous proximity to the Colorado River, would give Las Vegas a second chance to achieve prosperity. Construction on Hoover Dam (originally Boulder Dam, subsequently renamed for the president who authorized the project) began in 1931 in a canyon 45 miles (72 km) southeast of Las Vegas. Providing an influx of $165 million to the southwestern economy, Hoover Dam played a major role in preventing Las Vegas from drying up, both financially and literally. Not only did it create jobs, but it also created Lake Mead, the massive reservoir that today provides water to all of southern Nevada. More Government Help: The construction of Hoover Dam did not single-handedly save Las Vegas, however. The state legislature helped as well, by legalizing gambling in 1931 and thus solidifying the future of the town, though legislators and residents could never have known this at the time. The hordes of people who attended Hoover Dam's 1935 dedication set the city's now-formidable public relations machine into action. They went to work on what has become one of the lengthiest citywide tourism campaigns ever attempted. It didn't take long for the city to establish itself as a wild-West town with an "anything goes" attitude. Vices outlawed or heavily controlled elsewhere were legal here, available any hour of any day (or night).
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Answer: What happened to the operations after Union Pacific purchased the Los Angeles-Salt Lake line?

Albrecht Durer (/'dU@r@r, 'djU@r@r/; German: ['albRect 'dy:Ra]; 21 May 1471 - 6 April 1528) was a painter, printmaker and theorist of the German Renaissance. Born in Nuremberg, Durer established his reputation and influence across Europe when he was still in his twenties, due to his high-quality woodcut prints. He was in communication with the major Italian artists of his time, including Raphael, Giovanni Bellini and Leonardo da Vinci, and from 1512 he was patronized by emperor Maximilian I. His vast body of work includes engravings, his preferred technique in his later prints, altarpieces, portraits and self-portraits, watercolours and books. The woodcuts, such as the Apocalypse series (1498), retain a more Gothic flavour than the rest of his work. His well-known engravings include the Knight, Death, and the Devil (1513), Saint Jerome in his Study (1514) and Melencolia I (1514), which has been the subject of extensive analysis and interpretation. His watercolours also mark him as one of the first European landscape artists, while his ambitious woodcuts revolutionized the potential of that medium. Durer's introduction of classical motifs into Northern art, through his knowledge of Italian artists and German humanists, has secured his reputation as one of the most important figures of the Northern Renaissance. This is reinforced by his theoretical treatises, which involve principles of mathematics, perspective and ideal proportions.
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Answer:
What was one of his revered woodcuts he made in his twenties?