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Archive of optical illusions and weird illusions to challenge your mind. Many of these optical illusions can boggle anyone.

An encyclopedic collection of math resources for all grades. Arithmetic games, problems, puzzles, and articles

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Comprehensive encyclopedia of mathematics with 13,000 detailed entries. Continually updated, extensively illustrated, and with interactive examples.

PLoS ONE: an inclusive, peer-reviewed, open-access resource from the PUBLIC LIBRARY OF SCIENCE. Reports of well-performed scientific studies from all ...

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