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Numberphile is n interesting YouTube channel about fun number facts. There are currently thirty-three videos in the Numberphile collection. The videos cover things like 998,001 and its Mysterious Recurring Decimals, Pi and Bouncing Balls, and 1 and Prime Numbers.

I great re-print from 1972, where Alan Kay describes, even draws what is effectively a tablet or eBook, and argues for it's technological and pedagogical value in schools. Amazingly he priced this at $500, which was quite a sum back then, and almost exactly the price of netbooks and tablets today.

This tool is from the same people that brought us the great computational search engine Wolfram Alpha comes Wolfram Tones. Wolfram Tones uses algorithms, music theory, and sound samples to generate new collections of sounds. Visitors to Wolfram Tones can experiment with sounds and rhythms to make their own sounds. Wolfram Tones allows visitors to choose samples from fifteen different genres of music on which to build their own sounds. Once a genre is selected visitors can then alter the rhythms, instrumentation, and pitch mapping of their sounds. When satisfied with their creations, users can download their sounds or have them sent directly to their cell phones.

Gooru is a new service (still carrying the Alpha label) that aims to provide teachers and students with an extensive collection of videos, interactive displays, documents, diagrams, and quizzes for learning about topics in math and science. As a Gooru member you have access to hundreds of resources according to subject areas such as chemistry, biology, ecology, algebra, calculus, and more. Within each subject area you can look for resources according to media type such as video, interactive display, slides, text, and lesson plans. When you find resources that you want to use, drag them to the resources folder within your account. Gooru also offers you the option to add resources to your folders even if you did not find them within Gooru.

A search engine for learning. Aimed at Year 5+, millions of resources alligned to US Common Core standards.

"Students who self-assess are the best? That's what Alan November says. Research shows that students who self-assess their work become top students. What does this mean? Any school can improve with these three things."

WatchKnow has indexed over 15,000 online educational videos for children. Select from over 3,000 categories or search by subject and age level. Titles, descriptions, age level, and ratings are all added for usefulness. The site invites broad participation in a new kind of wiki system, guided by teachers.

Make the numbers to 20 with a limited number of numbers and signs.