Other interesting sites on the web

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Here's some other sites you might find interesting

Theories on cooperation Related to the Prisoner's Dilemma game
Critical Thinking Information and teaching resources for critical thinking
Science Notes on "The Useability of a Scientific Theory"
Puzzles Test out your brain power with a variety of puzzles
RET in NZ RET in NZ or "Choose to be Happy" site
RET in USA Rational Emotive Therapy site, USA -Albert Ellis Institute

Note:  While I find these sites interesting, and I hope you will too, I don't necessarily condone or agree with all that they say.