How Stuff Works
An incredible amount of information on one site! This is an excellent site for children to adults. There is almost no question on how things work that can not be found here. You can search on how anything works. Find out how and why a cat purrs or discover how nuclear power plants came about and how they work. Find information on how your car works and how to repair it. Find out how the ACLU (American Civil Liberties Union) got started and why it works. This site has every subject you can imagine. You could spend hours trying to find what is not on it. Easy to navigate and the terminology used is for all ages.