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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QUESTION: What can density explain?

One day, Phoebe woke up and found that her house had been broken into. Her front door was wide open. She went into the living room and saw that her television set and stereo were missing. She checked the kitchen, but didn't find anything missing there except for a clock. Then she saw that her purse had been stolen too. She called the police to report what had happened. The police officer told her that there had been a lot of cases like this in her neighborhood lately, and they were looking for the criminals. Phoebe went into her bedroom and started to cry. She had no money to buy a new television set or stereo. She was scared that the robbers might try to break into her house again. She called her friend Mary and asked her what to do. Mary told Phoebe to change her front door lock right away. She said she knew a detective who could try to find the robber who had broken into her house. Phoebe thanked Mary, and said she felt safe knowing that there was someone who could help her catch the robber so he wouldn't do it again.
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QUESTION: What made Phoebe cry?

Iwasaki's careful respect for the Long Beach program and its lawyers earned him the political capital he needed to complete his takeover in a matter of weeks. "The Long Beach program had strong support in the community so in a situation like that, one has to recognize that it's not like a takeover where I have all the answers and I know best," Iwasaki said. "The people in the community who are working there have the contacts and the knowledge that will allow service to continue." Things have gone less smoothly across town. There, Dudovitz, a longtime poverty lawyer and executive director of the San Fernando Valley's 36-year-old legal aid program, continues to struggle with his hostile takeover of the neighboring San Gabriel-Pomona Valleys service area one year after it was accomplished. On the bright side, Dudovitz has extended his respected program to clients in the San Gabriel-Pomona Valley, and he now operates on a much larger budget, $6.5 million last year. However, his clash with the old San Gabriel program resulted in litigation, bitter feelings and a mission that some say is not clearly focused on serving poor people. "It was a difficult situation that was probably mishandled by everyone," a longtime observer of the public interest community said of the San Fernando Valley-San Gabriel-Pomona Valley merger. "There are very few people who come out as the heroes. Personalities got involved when they shouldn't have. Things were said that caused bad feelings and couldn't be unsaid." Iwasaki's merger with the smaller, 48-year-old Long Beach program was friendly and fast, and no one - not even Long Beach board members - lost a job. When it was over, Iwasaki had $1 million more in federal dollars and two new offices. Long Beach clients regained services they had lost years ago when federal budget cuts and dwindling grants reduced the staff of 15 lawyers to five and cut immigration and consumer law programs. Iwasaki said, "[I judged the transition] better than I could have hoped for."
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QUESTION: In the eyes of the public interest community, was Dudovitz's hostile takeover well-handled?

Legal assistance for battered women is hard to come by. But it just got a little easier to find in Tarrant County. This month, the federal Violence Against Women Office awarded a two-year, $350,000 grant to the Women's Haven of Tarrant County. The money will allow the shelter to add a second full-time attorney to its staff and contract with the law school clinic at Texas Wesleyan University for pro bono and student services. Most important, the funds will help fill a frustrating gap. The Women's Haven, which provides shelter and outreach to domestic-violence victims, already has a full-time attorney. But that person is prohibited (by funding parameters) from representing women in matters of divorce or child custody. That's not a problem for most of the shelter's indigent residents, who can access free legal aid locally from West Texas Legal Services. But many of the clients served by the Women's Haven outreach programs are the working poor, who don't qualify for free legal services. Divorces and custody battles are simply out of their financial reach. "They can't begin to save up enough money for a divorce, so they're stuck," says Sonyia Hartwell, the Women's Haven's associate director. "They're completely shut out of the civil-law system." In Texas, unlike in some other states, women who aren't divorced can't gain full control over their portion of assets. And they can't obtain child support. The grant will also provide law students with valuable experience working these types of cases. "They can't go to court, but they can interview clients and do all the initial intake work that needs to be done" as well as investigative work, says Hartwell. And there's no shortage of abuse victims who need this kind of help. "Within 60 days of hanging out her or his shingle," says Hartwell of the yet unhired new attorney, "we'll have an active caseload of 20 or more."
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QUESTION:
Who is "completely shut out of the civil-law system"?