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What Does a Camshaft Do?

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Camshafts have a great effect on engine performance. Learn about camshafts, single and double overhead cams, pushrod engines and camshaft design.

What Does a Humidifier Do? How Humidifiers Work

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Is the air feeling a little too dry in your home? A humidifier can help make things more comfortable -- and even save a little wear and tear on your house. But what does a humidifier do, exactly?

What Is a Watt?

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Amps, volts, watts, and ohms are the main units used for measuring electricity. Find out how amps, watts, volts, and ohms relate to electricity.

Ultimate Guide to the Lombardy Wine Region

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The Lombardy wine region is among Italy's best. Learn all about the Lombardy wine region at HowStuffWorks.

Exactly why is your thyroid so important?

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The thyroid gland works to communicate with various parts of the body. Learn more about the thyroid gland and how it sends messages.

How Spray-on Solar Panels Work

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Spray-on solar panels could change the way we think about solar power. Learn all about spray-on solar panels at HowStuffWorks.

How Reo Cars Work

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The Reo Motor Car Company was created in 1904 out of an argument at Olds Motor Works. Learn all about Reo, which stopped making cars in 1936.

When you sit at your computer, browsing the Internet, playing video games and running word processors, it's easy to feel like you're in control. But have you ever thought about what really makes your desktop or laptop run?