Welcome to the official Rubik?s website, home of the world famous Rubik?s cube. Learn how to solve the cube, watch Rubik?s TV or buy a Rubik?s cube n...

wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual. Our multilingual how to manual has free step-by-s...

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YouTube is a place to discover, watch, upload and share videos.

For the student or professional - famous inventors and inventions - history timelines - patents trademarks and copyrights - manufacturing resources - ...

Instructables is the Biggest How To and DIY community where people make and share inspiring, entertaining, and useful projects, recipes, and hacks.

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

Action packed math site for elementary and middle school students featuring math games, math word problems, math worksheets, logic puzzles, and math v...

Rekord-Klub SAXONIA, the international club for world record holders and record breaking