HowStuffWorks explains hundreds of subjects, from car engines to lock-picking to ESP, using clear language and tons of illustrations. We do the research so you don't have to.
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Very usefull information can be found in this site. How Stuff Works can explain almost everything with valid information. It's good just for people that loves making things with your own hands.
How Spam Works: is a more appropriate name for this site. While a few of the articles offer valid information, many of them are just google ad / spam generators that clog the net making it more difficult to conduct research.
For instance, did you know the front wheel of a vespa is attached to an axle? Really! ..... worthless.. And yes that was part of one of the articles.
How Stuff Works, the title says it all.: How Stuff Works is a wonderful site that explains the world around us. From how octopi change color to how the stock market works, the site explains (in a non-technical manner) how things work. Useful if you need specific information on a subject and fun to just browse around.