Freeplane
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Freeplane | Free Business & Enterprise software downloads at SourceForge.net
Application for Mind Mapping, Knowledge Management, Project Management. Develop, organize and communicate your ideas and knowledge in the most effective way.

Why Lucky Charms Sometimes Work
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Why Lucky Charms Sometimes Work: The Powerful Positive Performance Psychology Of Superstition
In a test conducted by researchers from the University of Cologne, participants on a putting green who were told they were playing with a “lucky ball” sank 6.4 putts out of 10, nearly two more putts, on average, than those who weren’t told the ball was lucky. That is a 35% improvement. The results suggest new thinking in how to view luck and are intriguing to behavorial psychologists.

Gödel's incompleteness theorems
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Gödel's incompleteness theorems - Wikipedia, the free encyclopedia
The first incompleteness theorem states that no consistent system of axioms whose theorems can be listed by an "effective procedure" (e.g., a computer program, but it could be any sort of algorithm) is capable of proving all truths about the relations of the natural numbers (arithmetic). For any such system, there will always be statements about the natural numbers that are true, but that are unprovable within the system. The second incompleteness theorem, a corollary of the first, shows that such a system cannot demonstrate its own consistency.

How to Use the Taxonomy of the Logical Fallacies
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How to Use the Taxonomy of the Logical Fallacies
The Taxonomy is a tree-like structure that classifies all of the fallacies in these files by the subfallacy relation. A subfallacy, which is a specific version of a more general fallacy, has whatever features the more general fallacy has, together with specific features which set it apart and make it worth naming in its own right.

An Interview with Douglas R. Hofstadter
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An Interview with Douglas R. Hofstadter, following ''I am a Strange Loop''

Douglas R. Hofstadter is best-known for his book Gödel, Escher, Bach (GEB for short). In his latest book, I am a Strange Loop, he visits once again many of the themes originally presented in that book.

Jenn 3d
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Jenn 3d
Jenn is a toy for playing with various quotients of Cayley graphs of finite Coxeter groups on four generators. Jenn builds the graphs using the Todd-Coxeter algorithm, embeds them into the 3-sphere, and stereographically projects them onto euclidean 3-space. (The models really live in the hypersphere so they looked curved in our flat space.) Jenn has some basic motion models governing the six degrees of freedom of rotation of the hypersphere.

Algebraic Surfaces Gallery
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Algebraic Surfaces Gallery
A gallery of beautiful algebraic surfaces
Game Theory
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Game Theory (Stanford Encyclopedia of Philosophy)
Game theory is the study of the ways in which strategic interactions among economic agents produce outcomes with respect to the preferences (or utilities) of those agents, where the outcomes in question might have been intended by none of the agents.

MIT OpenCourseWare
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Free Online Course Materials | MIT OpenCourseWare
Free lecture notes, exams, and videos from MIT.
No registration required.