NEIADan's wife here. Studies (Nature, IBM) have found that Wikipedia's error rate is comparable to Encyclopedia Britannica. Neither is perfect, and there are probably very few sources that are error free. Although anyone can contribute to Wikipedia, errors are often quickly corrected by other contributers. I work in a library, and know that the acceptance of online sources like Wikipedia has been slow to happen by people who ARE trained to search for and verify information, but Wikipedia is now commonly used as a resource by many. If you do not want to rely on Wikipedia to report on its own reliability, it's easy enough to Google the studies.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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