Guide to the Constellations of the Night Sky (Popularity: )

Mythology, legend and facts.
Category: Science\Astronomy\Amateur\Constellations

BookTalk (Popularity: )

Dedicated to the advancement of critical thinking, reason, intelligence, freedom of inquiry, philosophy and the ...
Category: Science\Science in Society\Skeptical Inquiry

University of Life (Popularity: )

Ranging from serious IQ tests to the Sexual Color Test.
Category: Science\Social Sciences\Psychology\Personality

Frontier Organizations on the Web (Popularity: )

A major list of futuristic organizations in the areas of future studies, philosophy, personal and ...
Category: Science\Biology\Cryobiology\Cryonics

Sigma Test (Popularity: )

Admission test for several high-IQ societies. Contains sections with various levels of difficulty.
Category: Science\Social Sciences\Psychology\Intelligence

The Enigmatic World of Philip Carter (Popularity: )

Collection of brain teasers from the author of IQ books.
Category: Science\Math\Recreations\Games and Puzzles

Test of Logical Abstractive Perception (Popularity: )

Overview of its psychometric properties and links to the test itself.
Category: Science\Social Sciences\Psychology\Intelligence

Cerebrals Online Intelligence Tests (Popularity: )

This page gathers online intelligence tests prepared by members of the Cerebrals Society.
Category: Science\Social Sciences\Psychology\Intelligence

Brain Teasers by QBrute (Popularity: )

Original brain teasers with solutions.
Category: Science\Math\Recreations\Games and Puzzles

The Puzzling World of Barry R. Clarke (Popularity: )

Brain teasers, articles and puzzles forum.
Category: Science\Math\Recreations\Games and Puzzles