Density is also an important physical property of matter. The concept of density combines what we know about an objects mass and volume. Density reflects how closely packed the particles of matter are. When particles are packed together more tightly, matter is more dense. Differences in density of matter explain many phenomena. It explains why helium balloons rise. It explains why currents such as the Gulf Stream flow through the oceans. It explains why some things float in or sink. You can see this in action by pouring vegetable oil into water. You can see a colorful demonstration in this video.
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Answer: What physical property of matter combines what we know about an object's mass and volume?

The film focuses on various guests staying at New York City's famed Waldorf-Astoria Hotel . Among them are lonely screen star Irene Malvern , in town with her maid Anna for a childhood friend's wedding and the premiere of her latest movie ; war correspondent Chip Collyer , mistaken for a jewel thief by Irene but playing along to catch her attention ; flyer Capt. James Hollis , wounded in World War II and facing perilous surgery in three days ; wealthy shyster Martin X. Edley , who is trying to sign the Bey of Aribajan to a shady oil deal ; Oliver Webson , a cub reporter for Collier's Weekly hoping to expose Edley ; and bride-to-be Cynthia Drew , whose upcoming wedding is endangered by her belief her fianc Bob is in love with Irene Malvern . Also on the scene are Bunny Smith , the hotel's stenographer/notary public , who hopes to escape her low income roots by marrying Edley , and reporter Randy Morton , who loiters in the lobby hoping to stumble upon a scoop for his newspaper . In the opening scene , Randy Morton describes a typical Friday afternoon at the Waldorf . A newlywed couple discover there are no rooms available , and are given use of an apartment by a Mr. Jesup , who is going away for the weekend . Edley finds Jesup in the lobby and tries to involve him in a deal with the Bey of Aribajan , a wealthy oil shiek . Jesup refuses , but Edley knows that Jesup will be gone all weekend and has until Monday morning to get the Bey to sign a contract based on Jesup's presumed involvement .
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Answer: Which two women are hoping to be married someday?

Although Bin Laden, Atef, and KSM initially contemplated using established al Qaeda members to execute the planes operation, the late 1999 arrival in Kandahar of four aspiring jihadists from Germany suddenly presented a more attractive alternative. The Hamburg group shared the anti-U.S. fervor of the other candidates for the operation, but added the enormous advantages of fluency in English and familiarity with life in the West, based on years that each member of the group had spent living in Germany. Not surprisingly, Mohamed Atta, Ramzi Binalshibh, Marwan al Shehhi, and Ziad Jarrah would all become key players in the 9/11 conspiracy. Mohamed Atta was born on September 1, 1968, in Kafr el Sheikh, Egypt, to a middle-class family headed by his father, an attorney. After graduating from Cairo University with a degree in architectural engineering in 1990, Atta worked as an urban planner in Cairo for a couple of years. In the fall of 1991, he asked a German family he had met in Cairo to help him continue his education in Germany. They suggested he come to Hamburg and invited him to live with them there, at least initially. After completing a course in German, Atta traveled to Germany for the first time in July 1992. He resided briefly in Stuttgart and then, in the fall of 1992, moved to Hamburg to live with his host family. After enrolling at the University of Hamburg, he promptly transferred into the city engineering and planning course at the Technical University of Hamburg-Harburg, where he would remain registered as a student until the fall of 1999. He appears to have applied himself fairly seriously to his studies (at least in comparison to his jihadist friends) and actually received his degree shortly before traveling to Afghanistan. In school, Atta came across as very intelligent and reasonably pleasant, with an excellent command of the German language. When Atta arrived in Germany, he appeared religious, but not fanatically so. This would change, especially as his tendency to assert leadership became increasingly pronounced. According to Binalshibh, as early as 1995 Atta sought to organize a Muslim student association in Hamburg. In the fall of 1997, he joined a working group at the Quds mosque in Hamburg, a group designed to bridge the gap between Muslims and Christians. Atta proved a poor bridge, however, because of his abrasive and increasingly dogmatic personality. But among those who shared his beliefs, Atta stood out as a decisionmaker.
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Answer: Who were the jihadists that met in Germany and determined that fluency in English would better their odds in a successful attack on the US?

There once was a guy named Kevin and girl named Erin. They really liked spending time together. One day, Kevin traveled from his home in the United States of America to Erin's house in England. They then thought to take a sudden trip around the world. They first traveled by plane around Europe, where they saw many different people and sights. They then took a boat to Africa and Asia, where they went on a trip through the mountains. Later in the month, they traveled to China by train and were allowed to see how different life was over there. Next they took another plane to Australia, where they had a lot of fun seeing kangaroos and a different type of English speaking people. After spending a week in Australia, Kevin and Erin took a really long plane ride to North America, where they drove across the land. They saw everything from the mountains to forests. They even got to visit the beach! Because they had so much fun, Kevin returned home with Erin to England where they hung out and spent the next few days and months talking about all of the neat things they saw and did on their trip.
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Answer:
In what country were Erin and Kevin located when they decided to take a trip around the world?