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We wouldn't get very far without LAN switches -- bedlam would break loose at each network junction. Learn how LAN switches work.

Believe it or not, the marvel we know as the helicopter began as a Chinese top consisting of a shaft - a stick - adorned with feathers on one end.

A vaccine is, essentially, a cure for an illness or disease. Who came up with the idea for vaccines and do we give too many shots now?

Grills provide us with an easy way to cook food over a fire. Learn about the different types of grills and read expert reviews on gas grills.

Learn the basics of a manual transmission and explore transmission parts and the inner workings of transmissions.

The NLOS cannon can fire rounds from far away with less collateral damage. Read about NLOS cannon and its role in future military warfare.

Excessive underarm sweating can be embarrassing. Visit HowStuffWorks to learn all about excessive underarm sweating.

Does stress really cause gray hair? Explore this article to find out where gray hair comes from and what role stress plays in its development.

Google Groups is a social networking site that has become very popular. Learn all about Google Groups at HowStuffWorks.

In vitro fertilization is the most common type of assisted reproductive technology. Learn more about how the vitro fertilization process works.

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