[Discover] Logical Fallacies: The Fallacy Files http://www.fallacyfiles.org/
(philosophy reference fallacy logic) 
[Discover] Fallacies Exercises http://www.cuyamaca.net/bruce.thompson/Fallacies/exercises_main.asp (argument fallacies rhetoric logic)
[Discover] Paraconsistent Logic http://plato.stanford.edu/entries/logic-paraconsistent/ (philosophy logic)
[Discover] Logic is more powerful than God. God cannot be outside of logic. http://www.vexen.co.uk/religion/god_logic.html (religion logic)
[Discover] Logic and Games (Stanford Encyclopedia of Philosophy) http://plato.stanford.edu/entries/logic-games/ (logic philosophy mathematics modal)
[Discover] Hypercomputation - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Hypercomputation (physics quantum complexity jhu)
[Discover] Correlation does not imply causation - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Correlation_does_not_imply_causation (wikipedia science correlation logic)
[Discover] Combinatory logic - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Combinatory_logic (mathematics haskell functional logic)
[Discover] Tarski's Truth Definitions (Stanford Encyclopedia of Philosophy) http://plato.stanford.edu/entries/tarski-truth/ (philosophy logic tarski)
[Discover] COMPUTABILITY LOGIC: a theory of interactive computation HOMEPAGE http://www.cis.upenn.edu/~giorgi/cl.html (theory cs logic computabilitylogic)
[Discover] Classic Computer Science Puzzles http://www.codinghorror.com/blog/archives/000951.html (algorithms programming logic puzzle)
[Discover] Temporal Logic (Stanford Encyclopedia of Philosophy) http://plato.stanford.edu/entries/logic-temporal/ (logic coreslice philosophy temporallogic)
[Discover] Lojban : Home Page http://www.lojban.org/tiki/tiki-index.php?page=Home%20Page (language lojban linguistics logic)
[Discover] The World Wide Web Virtual Library: The Z notation http://vl.zuser.org/ (programming logic languages specification)
[Discover] Peter Suber: Logical Systems http://www.earlham.edu/~peters/courses/logsys/lshome.htm (reference mathematics logic philosophy)
[Discover] Constructive Mathematics (Stanford Encyclopedia of Philosophy) http://plato.stanford.edu/entries/mathematics-constructive/ (mathematics toread philosophy constructive)
[Discover] GOEDEL MACHINE HOME PAGE http://www.idsia.ch/~juergen/goedelmachine.html (research singularity science reference)
[Discover] Toposes, Triples and Theories http://www.case.edu/artsci/math/wells/pub/ttt.html (mathematics categorytheory books free)
[Discover] Fallacies http://www.nizkor.org/features/fallacies/ (debate argument reference philosophy)
[Discover] Logic http://www.galilean-library.org/int4.html (logic philosophy)
[Discover] John Halleck's Logic Systems Axiom List http://home.utah.edu/~nahaj/logic/structures/axioms/index.html (systems structure logic)
[Discover] Welcome to Play-Hookey! http://www.play-hookey.com/ (electronics tutorial reference education)
[Discover] Fallacies Exercises http://www.cuyamaca.net/bruce.thompson/Fallacies/exercises_main.asp (argument fallacies rhetoric logic)
[Discover] Paraconsistent Logic http://plato.stanford.edu/entries/logic-paraconsistent/ (philosophy logic)
[Discover] Logic is more powerful than God. God cannot be outside of logic. http://www.vexen.co.uk/religion/god_logic.html (religion logic)
[Discover] Logic and Games (Stanford Encyclopedia of Philosophy) http://plato.stanford.edu/entries/logic-games/ (logic philosophy mathematics modal)
[Discover] Hypercomputation - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Hypercomputation (physics quantum complexity jhu)
[Discover] Correlation does not imply causation - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Correlation_does_not_imply_causation (wikipedia science correlation logic)
[Discover] Combinatory logic - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Combinatory_logic (mathematics haskell functional logic)
[Discover] Tarski's Truth Definitions (Stanford Encyclopedia of Philosophy) http://plato.stanford.edu/entries/tarski-truth/ (philosophy logic tarski)
[Discover] COMPUTABILITY LOGIC: a theory of interactive computation HOMEPAGE http://www.cis.upenn.edu/~giorgi/cl.html (theory cs logic computabilitylogic)
[Discover] Classic Computer Science Puzzles http://www.codinghorror.com/blog/archives/000951.html (algorithms programming logic puzzle)
[Discover] Temporal Logic (Stanford Encyclopedia of Philosophy) http://plato.stanford.edu/entries/logic-temporal/ (logic coreslice philosophy temporallogic)
[Discover] Lojban : Home Page http://www.lojban.org/tiki/tiki-index.php?page=Home%20Page (language lojban linguistics logic)
[Discover] The World Wide Web Virtual Library: The Z notation http://vl.zuser.org/ (programming logic languages specification)
[Discover] Peter Suber: Logical Systems http://www.earlham.edu/~peters/courses/logsys/lshome.htm (reference mathematics logic philosophy)
[Discover] Constructive Mathematics (Stanford Encyclopedia of Philosophy) http://plato.stanford.edu/entries/mathematics-constructive/ (mathematics toread philosophy constructive)
[Discover] GOEDEL MACHINE HOME PAGE http://www.idsia.ch/~juergen/goedelmachine.html (research singularity science reference)
[Discover] Toposes, Triples and Theories http://www.case.edu/artsci/math/wells/pub/ttt.html (mathematics categorytheory books free)
[Discover] Fallacies http://www.nizkor.org/features/fallacies/ (debate argument reference philosophy)
[Discover] Logic http://www.galilean-library.org/int4.html (logic philosophy)
[Discover] Critical thinking web http://philosophy.hku.hk/think/ (philosophy psychology tutorial criticalthinking)
[Discover] John Halleck's Logic Systems Axiom List http://home.utah.edu/~nahaj/logic/structures/axioms/index.html (systems structure logic)
[Discover] Welcome to Play-Hookey! http://www.play-hookey.com/ (electronics tutorial reference education)