Once admitted to practice by the highest court of a state (a function sometimes administered by the state's bar association), an American attorney may file legal pleadings and argue cases in any state court (federal courts usually require separate admission), provide legal advice to clients, and draft important legal documents such as wills, trusts, deeds, and contracts. In some states, real estate closings may be performed only by attorneys, even though the attorney's role in a closing may involve primarily notarization of documents and disbursement of settlement funds through an escrow account. Practicing law includes interviewing a client to identify the legal question, analyzing the question, researching relevant law, devising legal solutions to problems, and executing such solutions through specific tasks such as drafting a contract or filing a motion with a court. Most academic legal training is directed to identifying legal issues, researching facts and law, and arguing both the facts and law in favor of either side in any case. For several years, law schools have sent through far more students than new job openings have become available. This has often lead to attorneys (once they pass the bar) seeking work in other occupations, either by choice or by the lack of employment opportunities. This has led to a market in legal temps or contract attorneys, where attorneys spend a certain period of time working on tasks such as discovery for a case.

Gasoline Engines

Gasoline engines have the advantage over diesel in being lighter and able to work at higher rotational speeds and they are the usual choice for fitting in high-performance sports cars. Continuous development of gasoline engines for over a hundred years has produced improvements in efficiency and reduced pollution. The carburetor was used on nearly all road car engines until the 1980s but it was long realized better control of the fuel/air mixture could be achieved with fuel injection. Indirect fuel injection was first used in aircraft engines from 1909, in racing car engines from the 1930s, and road cars from the late 1950s.

Gasoline Direct Injection (GDI) is now starting to appear in production vehicles such as the 2007 BMW MINI. Exhaust gases are also cleaned up by fitting a catalytic converter into the exhaust system. Clean air legislation in many of the car industries most important markets has made both catalysts and fuel injection virtually universal fittings. Most modern gasoline engines are also capable of running with up to 15% ethanol mixed into the gasoline - older vehicles may have seals and hoses that can be harmed by ethanol. With a small amount of redesign, gasoline-powered vehicles can run on ethanol concentrations as high as 85%. 100% ethanol is used in some parts of the world (such as Brazil), but vehicles must be started on pure gasoline and switched over to ethanol once the engine is running. Most gasoline engines cars can also run on LPG with the addition of an LPG tank for fuel storage and carburetion modifications to add an LPG mixer. LPG produces fewer toxic emissions and is a popular fuel for fork lift trucks that have to operate inside buildings.