Featured URLs in this category:
HowStuffWorks
HowStuffWorks explains hundreds of subjects, from car engines to lock-picking to ESP, using clear language and tons of illustrations. We do the research so you don't have to.
http://www.howstuffworks.com/
Wikipedia, the free encyclopedia
A multilingual, web-based, free content encyclopedia project, written collaboratively by volunteers from all around the world.
http://en.wikipedia.org
URLs listed in this category:
Eric Weisstein's World of Astronomy
A web encyclopedia with more than 500 entries about astronomy
http://scienceworld.wolfram.com/astronomy/
Encyclopaedia Britannica
Encyclopedia Britannica Online, featuring the complete Encyclopedia Britannica, Britannica Concise Encyclopedia, Merriam-Webster's Dictionary & Thesaurus, videos, web sites, and magazines.
http://www.britannica.com/
Wikipedia, the free encyclopedia
A multilingual, web-based, free content encyclopedia project, written collaboratively by volunteers from all around the world.
http://en.wikipedia.org
HowStuffWorks
HowStuffWorks explains hundreds of subjects, from car engines to lock-picking to ESP, using clear language and tons of illustrations. We do the research so you don't have to.
http://www.howstuffworks.com/
LoveToKnow 1911
Free online encyclopedia based on the eleventh edition of the Encyclopaedia Britannica, first published in 1911.
http://www.1911encyclopedia.org/