Almost everyone knows about Wikipedia. It is the free online encyclopedia that is editable by anyone with an internet connection. It is a great resource for some quick knowledge on various subjects, like the early history of playing cards.
WikiHow is based on the same idea as Wikipedia, anyone can write and edit articles. The difference is that WikiHow is composed of how-to articles. So when you are done reading about the history of playing cards, you can go and learn how to build a tower of cards.
WikiHow is an excellent reference when you are interested in a new hobby or a technique to make your life easier. Just today I visited to learn some basic techniques of meditation.
If you are ever bored and looking for things to read, the article of the day at both WikiHow and Wikipedia are great places to start.
