I wish I had this when I was growing up. Education in't fun when it follows prescription. Encyclopedias were great... but de-shelving them & flipping pages to find an alphabetical topic was too tedious.
Now Wikipedia... point & click knowledge, that's fun.
Wikipedia is one of my top 5 favorite sites on the web. One can easily spend hours there clicking away on trivial subjects.
Lists of topics - Wikipedia, the free encyclopedia