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.