You know that friction also causes heat. Think about when you rub your hands together. It is friction that makes them warm. But why does this happen? Friction causes the molecules on rubbing surfaces to move faster. Faster moving particles have more heat energy. Heat from friction can be useful. Can you think of other places where you might find friction? Friction also lets you light a match. Heat from friction can also cause problems. It can cause a car to overheat. To reduce friction, oil is added to the engine. Oil coats the surfaces of moving parts. This coating of oil makes them slippery. When things are slippery there is less friction. Have you ever seen a sign that says, slippery when wet? This too has to do with friction. Water, like oil, can reduce friction. The wet surface may allow your shoes to slide more easily.
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QUESTION: What can happen in a car when there is too much friction?

In Colombia, the drug-financed guerrillas trying to seize the country and destroy democracy include M-19, which Castro has clearly backed. Robert Merkel, a former U.S. attorney handling drug indictments in Florida, doesn't think for a minute that Castro's much publicized trials of high officials engaged in the drug trade mean he has broken off with the Medellin drug cartel. "If the cartel succeeds in blackmailing the Colombian authorities into negotiations, the cartel will be in control and Fidel can exploit his past relationships with them," he told the Journal's David Asman recently. The struggle against the drug lords in Colombia will be a near thing. This week, the government arrested Jose Abello Silva, said to be the fourth-ranking cartel leader. He will probably be extradited to the U.S. for trial under an extradition treaty President Virgilia Barco has revived. Later, another high-ranking trafficker, Leonidas Vargas, was arrested and 1,000 pounds of dynamite seized. Mr. Barco has refused U.S. troops or advisers but has accepted U.S. military aid. President Bush has agreed to meet within 90 days with Mr. Barco, President Alan Garcia of Peru and President Jaime Paz Zamora of Bolivia to discuss the drug problem. It might not be a bad idea to do that sooner, rather than later. After the Panama fiasco, they will need some reassurance. Certainly, the Colombian press is much in need of that.
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QUESTION: As the struggle against the drug lords in Colombia continues, who was arrested with 1,000 pounds of dynamite?

Lash is associate dean at the University of Southern California Law School. Johnson is a justice on California's Second District Court of Appeal. Lash and Johnson are co-chairs of the California Commission on Access to Justice. The full report can be viewed at (www.calbar.org). In her year-long odyssey through the California justice system, Katherine, a 35-year-old single mother with three children, experienced failure at every turn. Leaving her abusive husband, she moved into the only apartment she could afford, and soon discovered a broken toilet and non- working oven, rats and roaches, and a fourthfloor landing with no railing. She began withholding rent pending repairs her landlord refused to make, but then her Medi-Cal benefits were cut off when she could not provide rent receipts. She lost health care for her children and herself, although she is a borderline diabetic in need of medication and her children were suffering from rat bites. Katherine tried to seek help through the courts. Representing herself at an administrative hearing, she lost her appeal to restore Medi-Cal benefits because she did not have proper documentation of the rent account. When she went to a courthouse to file a complaint against her landlord, she found the process so confusing that she gave up and went home. According to "The Path to Justice: A Five-Year Status Report on Access to Justice in California," prepared by the California Commission on Access to Justice, Katherine is just one of 4.6 million poor Californians whose basic civil legal needs -- often involving such critical needs as housing, health care, education, employment, safety and transportation -- are not being addressed. California has a critical dearth of legal services for the poor, and, as this report makes clear, it is imperative that the state join with the federal government and private funders to increase resources so that all Californians, regardless of income, have equal access to our justice system. Our justice system is predicated on the assumption that both parties will be represented by lawyers who act as gatekeepers and guides through a complex legal system that would otherwise be inaccessible to many of us. Unfortunately, the most vulnerable members of our society are the least able to afford legal services. California does have a strong network of legal aid organizations that try to help meet the needs of the poor, but there's just one legal aid lawyer available per 10,000 poor people. We may promise "justice for all," but for those who can't afford a lawyer, that promise is often a lie. In its new report, the Commission on Access to Justice notes some significant steps toward providing equal access to justice for all Californians.
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QUESTION: What repairs or issues caused Katherine to withhold rent?

(CNN) -- Declaring 2010 "The best year in safety performance in our company's history," Transocean Ltd., owner of the Gulf of Mexico oil rig that exploded, killing 11 workers, has awarded its top executives hefty bonuses and raises, according to a recent filing with the U.S. Securities and Exchange Commission. That includes a $200,000 salary increase for Transocean president and chief executive officer Steven L. Newman, whose base salary will increase from $900,000 to $1.1 million, according to the SEC report. Newman's bonus was $374,062, the report states. Newman also has a $5.4 million long-term compensation package the company awarded him upon his appointment as CEO in March 2010, according to the SEC filing. The latest cash awards are based in part on the company's "performance under safety," the Transocean filing states. "Notwithstanding the tragic loss of life in the Gulf of Mexico, we achieved an exemplary statistical safety record as measured by our total recordable incident rate and total potential severity rate," the SEC statement reads. "As measured by these standards, we recorded the best year in safety performance in our Company's history." The company called that record "a reflection on our commitment to achieving an incident-free environment, all the time, everywhere," the SEC filing states. The company did not respond to an e-mail from CNN seeking comment. The April 20, 2010, explosion on the Deepwater Horizon rig injured 17 workers and killed 11 others, including nine Transocean employees, according to the SEC filing. It has been called the worst spill in U.S. history. The well was capped three months later, but not before millions of barrels of oil spilled into the Gulf. In January, President Barack Obama's National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling released a report that spread blame for the accident among Transocean, BP -- which leased the rig -- and Halliburton, which installed the rig's cement casing.
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QUESTION:
On what date did the worst oil spill in US history occur?