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The Merkava Main Battle Tank takes the best features from American, British and Soviet tanks and has been Israel's main line of defense since 1979.

HDTVs, receivers and programming are more than enough for most of us to digest. But learn what the next phase, called "upconverting," will mean.

A coping saw features a U-shaped frame with a swiveling spigot, or clip, that eases the job of making turning cuts. We'll show you how to use one.

How are men's soaps different from others? Visit Discovery Health to learn how men's soaps are different from others.

Do you know how swine flu got that name? The virus doesn't even come from pigs, so why call it swine? Learn about the swine flu name.

Don't let the common cold get you down. Build your cold and flu defense by with these great facts and tips from HowStuffWorks.

Back pain and kidney infection is sometimes related. See how you can tell the difference between muscular back pain and kidney infection.

You need to test a torque converter, but you're not sure how to do it. Learn about how to test a torque converter in this article.

Sleep deprivation can affect you in surprising ways. Learn about 5 effects of sleep deprivation.

Need to know how to treat a side stitch? Visit HowStuffWorks to find out how to treat a side stitch.

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