HEATKEYS

The Khan Academy is a not-for-profit 501(c)(3) with the mission of providing a world-class education to anyone, anywhere. Despite being the work of one man, Salman Khan, this 1600+ video library is the most-used educational video resource as measure...

The Math Forum is the comprehensive resource for math education on the Internet. Some features include a K-12 math expert help service, an extensive database of math sites, online resources for teaching and learning math, plus much more.

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

BigRiddles has the best riddles on the web. We only pick the best riddles for our site.

Scientific physics forums for professionals and students to discuss serious issues and topics regarding physics in theory, practice, study and reality. Students can also find help for homework and career perspectives

Web site for Philosophical Review.

See what your friends are reading. Keep track of what you

Searchable lyrics database featuring 450000+ lyrics to almost 15,000 artists.

Printable brain teasers for kids and adults, riddles, logic puzzles, paradoxes, optical illusions, IQ tests, free brain games, lawyer jokes and other challenges for your mind.

The largest dictionary of idioms and phrases currently in use in British, American and Australian English. Over 12,000 phrases and expressions.

Online shopping from the earth's biggest selection of books, magazines, music, DVDs, videos, electronics, computers, software, apparel & accessories, shoes, jewelry, tools & hardware, housewares, furniture, sporting goods, beauty & person...