It's actually not possible. Britannica has officially halted publishing.
http://m.guardian.co.uk/books/2012/mar/13/encyclopedia-br...
My son is 9, and we do our research nearly 100% online. As do I (college student).
Wikipedia is a blurb, and not for serious research. We MAY use it as a jumping off point BUT
- US State Dept
- National Geographic
- That country's actual website
- Museums (NHM, Lourve, British museum, Smithsoneon, and HUNDREDS of other museums are all online... Exhibits only tip the iceberg... There are 10s of thousands of pages of research and articles online)
- Specialty Pages (CIA, FBI, WHO, CDC, Zooilogical Society, Anthropology society, NASA, US Civil War, Falklands War, Weyrhauser, Cocacola.... You name it and that govt. agency, NGO, or company has a website with constantly updating information)
- Journalistic Sites (AP, BBC, NYT, Al Jazeera, Bejiing Times, Seattle PI... There are THOUSANDS of legit journalistic sources online)
- Deep Science (Peer Review Database)
- first person sources AND orignial documents (thanks to Gutenberg and many universities... What scholars had to travel to see 20 years ago, and students could only read about those scholars experiences... Original source documents are now painstakenly scanned and online. Ditto voice and music archives.
- Lectures. UCLA, Oxford, and many other prestigious universities now publish entire courses online complete with lectures, texts, etc. I 'took' a class on Islamic pottery a few months ago just by downloading the files from Oxford. No registration or money required.
- Lectures. TED Talks.
The list, quite literally, goes on.