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Learn about surround sound technology, get buying tips, read sound system reviews and compare prices and features on popular system models.

The Gemini spacecraft took 20 astronauts to space and back. Find out how the Gemini spacecraft took NASA one step closer to landing on the moon.

StumbleUpon is an online social network that lets members share their favorite sites with other people. Learn how StumbleUpon lets you stumble sites.

Perfume is any substance that you wear and that smells. There are no requirements for it to smell good. Learn more about perfume at HowStuffWorks.

Avoiding tax mistakes will keep you out of hot water with the IRS and keep more money in your pocket. Read our list of 10 common tax mistakes.

Sunspots are explained in this article. Learn about sunspots.

Waterless toilets are a great way to save water. Visit HowStuffWorks to learn all about waterless toilets.

Wondering how MythBusters works and what's the secret to Discovery Channel MythBusters? See how MythBusters works now.

If you have pets, you may have wondered whether they know what you're thinking. Learn what pet psychics claim that they can do.

Microprocessors are at the heart of all computers. Learn how microprocessors work and about microprocessor technology and development.

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