Mathematics

• American Mathematical Society

• Mathematical Association of America

• Frequently Asked Questions in Mathematics

• History of Mathematics

• The Calculus Page

• The Prime Number Page

• Mathematica Integrator

• Wolfram Alpha

• Pi in the Sky

• Cut the Knot

• Math Archives

• Math Lair

• Khan Academy

• Vi Hart Videos

• Numberphile

• Redwood Empire Mathematics Tournament

• Whiskeytown Lake Mathematics Congress

• HSU Math Club at Facebook      

• My Math-Crostics

Astronomy

• Sky and Telescope

• Heavens Above

• Astronomy Picture of the Day

• Hubble Telescope Pictures

• Astronomers of  Humboldt

Other

• Association for Computing Machinery

• Sigma Xi

• Scientific American

• National Geographic Society

• Nature Conservancy

• World Wildlife Fund

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• The Redwood Region Audubon Society 

• The American Civil Liberties Union

• Weekend Edition Sunday Puzzle 

• Palindromes 

• Quotations

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• Star Trek

• The Internet Movie Database