You should definitely know about these... kinda like an alternative to Wikipedia.
"Online Reference Shelf"
- Topic/concept overviews
- Published, authoritative sources
- TIP: keep your search simple — 1 or 2 words
Example Encyclopedia Articles:
Alan Mathison Turing (1912-54)
Turing, Alan
Selma March (1965)
Selma-to-Montgomery, Alabama, Civil Rights Marches