Expert guides making millions

The world is changing rapidly.  There are so many things to do and learn.  It's impossible for us to know everything about every subject.  About.com is a website that teaches us about any specific subject we are interested in.  It's a website composed of experts talking about the subjects they know alot about.  We can learn about any subject from How to make Philly Cheese Steak Sandwiches to Career planning.  About.com has different channels:  Autos, Business and finance, Cities and towns, Computing and technology, Education, Electronics and Gadgets, Entertainment, Food and drink, Health, and alot more.  It's the ultimate one stop guide for a subject we don't know anything about.  It's making millions.
 

Problem:  There are too many things to know and learn.  We don't know many subjects.
Idea/Solution:  Website + Experts + Subjects + simple guides + Free
Site:  http://About.com