If you wanted to learn without paying thousands of rupees for expensive textbooks ,help is here. This is an initiative by Rice University called connexions and I quote "
Connexions is:
a place to view and share educational material made of small knowledge chunks called modules that can be organized as courses, books, reports, etc. Anyone may view or contribute:
- authors create and collaborate
- instructors rapidly build and share custom collections
- learners find and explore content "
The textbooks are basically mashups of modules by experts around the world. Especially check out the applied statistics textbook.
I kind of liked it better than Google Knol ,but lately
Google Scholar is a good way to search for knowledge too.
The site is here at http://cnx.org/