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By Patrick Marshall Just because you're paranoid doesn't mean you're not being watched. When you're on the Internet, there are good reasons to have that eerie sense of being followed. By now, most of us know that websites can gather a surprising amount of information about your computer. For example, the page request you send to a site's server includes detailed information about your browser — not just which browser you're using, but the exact version, its configuration, and even the screen resolution the browser is running in. Other gathered data includes the page you came from, what document you're requesting, and — yes, your IP address. And don't think you have anonymity just because your service provider gives you a dynamic IP address. At a minimum, visited websites can tell what service provider you're with and what city or region you are in. What's more, any communication with a Web server gives it the opportunity to deposit a...

By Neal Litherland, eHow Contributor Kevlar, like many brand names for complicated items, isn't very well understood. This material is used popularly in bulletproof vests due to its intensely strong and hard-to-corrode weave. Just what this material is, however, and how it's made are issues that become much more complex to explain. Definition Kevlar is made of an extremely strong fabric called an aramid fabric, which is chemically related to nylon. This fabric, which is already very tough and durable, is then woven in a pattern similar to tiny spiderwebs all interlocked to provide additional strength and durability. Aramid fibers like kevlar are resistant to wear, tear and heat, and have absolutely no melting point. Types Like any compound, kevlar comes in a variety of different types. Kevlar 29 is the fabric that is woven to make bulletproof vests. However, kevlar 49 is harder and not at all fabric-like. This material can be used to make frames for bicycles or hull...