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Capture, organize, and tackle your to-dos from anywhere | Trello

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Make the impossible, possible with Trello. The ultimate tool to boost your productivity. Escape the clutter and chaos—stay efficient with Inbox, Boards, and Planner from anywhere, even on mobile.

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Duolingo is the world's most popular way to learn a language. It's 100% free, fun and science-based. Practice online on duolingo.com or on the apps!

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Services provided by Glogster.com have been temporarily disabled for operational reasons.

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Services provided by Glogster.com have been temporarily disabled for operational reasons. We are in the process of disabling all recurring payments, but we do recommend that you contact your bank or credit card company directly to halt them.

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GeoGebra - the world's favorite, free math tools used by over 100 million students and teachers

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Free digital tools for class activities, graphing, geometry, collaborative whiteboard and more

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Math explained in easy language, plus puzzles, games, worksheets and an illustrated dictionary. For K-12 kids, teachers and parents.

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A brief introduction to art history

We understand the history of humanity through art. From prehistoric depictions of bison to contemporary abstraction, artists have addressed their time and place in history and expressed universal truths for tens of thousands of years.

A brief introduction to art history

We understand the history of humanity through art. From prehistoric depictions of bison to contemporary abstraction, artists have addressed their time and place in history and expressed universal truths for tens of thousands of years.

Explore art from around the world

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Art history | Arts and humanities | Khan Academy

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We understand the history of humanity through art. From prehistoric depictions of woolly mammoths to contemporary abstraction, artists have addressed their time and place in history and have expressed universal human truths for tens of thousands of years.

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Measure acceleration due to gravity G using a free fall apparatus and a scaler timer

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From breaking news and entertainment to sports and politics, get the full story with all the live commentary.

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Kahoot! | Learning games | Make learning awesome!

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Kahoot! is a game-based learning platform that brings engagement and fun to 1+ billion players every year at school, at work, and at home.