SciQuery - Directory of Math & Science- Mathematics

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The Prime Pages
Are you looking for the largest known primes? Lists of records? Information on who finds the biggest primes (and how?) You are at the right place! Here we keep the list of the 5000 largest known primes, updated hourly.
http://primes.utm.edu/ - [ Site Details ] [ Report This Site ]

Visual Fractions
An online fraction tutorial with line and circle illustrations. Winner of many awards for its role in math education.
http://www.visualfractions.com/ - [ Site Details ] [ Report This Site ]

The Joy of Pi
With incisive historical insight and a refreshing sense of humor, The Joy of Pi brings us the story of pi and humankind's fascination with it, from Archimedes to da Vinci to the modern day Chudnovsky brothers, who holed up in their Manhattan apartment with a homemade supercomputer churning out digits of pi into the billions.
http://www.joyofpi.com/ - [ Site Details ] [ Report This Site ]

LavaRND
Downloadable pseudo-random number generator. The LavaRND generator is seeded with a seven-way cryptographic hash of a digitization of a chaotic system, or, in other words, a digital picture of six Lava Lite Lamps.
http://www.lavarnd.org/ - [ Site Details ] [ Report This Site ]

HexDex Directory
General human-edited web directory of quality websites.

Qettle Web Directory
Human-edited web directory of high quality websites.

Zeoma Directory
Web directory offering regular and featured submissions.

UnaDir Directory
Human-edited web directory that is neatly organized and searchable.