How Things Work

www.howstuffworks.com
The site name speaks for itself, it is a brilliant place to really see, discover how things works. By things i mean absolutely anything be it an eraser to your speakers t your computers to the minutest part inside your computer or any other device you want. Just name it and they have it.
It explains you in detail about the way it works and the best of all it does it in the language we understand and enjoy.
for eg. This link below explains "how automatic transmission in vehicles work".
http://auto.howstuffworks.com/automatic-transmission.htm

Its a wonderful place to spend your time.