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A free world-class education for anyone anywhere.

The Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education for anyone anywhere.

All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get a leg up in earthly biology. The Khan Academy's materials and resources are available to you completely free of charge.

General Information:
Over 3,800 Videos

Our library of videos covers K-12 math, science topics such as biology, chemistry, and physics, and even reaches into the humanities with playlists on finance and history. Each video is a digestible chunk, approximately 10 minutes long, and especially purposed for viewing on the computer.

You're joining millions of Khan Academy students from all over the world who learn at their own pace every single day.

 
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Vi Hart : Doodling in Math Class: Stars

By: Vi Hart

More videos/info: http://vihart.com/doodling Check out this cool star-making applet Ruurtjan sent me: http://stars. ruurtjan.com Doodling Infinity Elephants: http://www.youtube.com/watch?v=DK5Z709J2eo Doodling Snakes + Graphs: http://www.youtube.com/watch

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Doodling in Math Class: Squiggle Inception

By: Vi Hart

How to draw squiggles like a Hilbert.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Doodling in Math Class: Spirals, Fibonacci, and Being a ...

By: Vi Hart

Part 1: http://youtu. be/ahXIMUkSXX0 Part 3: http://youtu. be/14-NdQwKz9w More on Angle-a-trons: http://www.youtube.com/watch?v=o6W6P8JZW0o Note: Beautiful spirally non-Fibonacci pinecones are very rare! If you find one, keep it.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Doodling in Math Class: Snakes + Graphs

By: Vi Hart

More videos/info: http://vihart.com/doodling Doodling Stars: http://www.youtube.com/watch?v=CfJzrmS9UfY Doodling Binary Trees: http://www.youtube.com/watch?v=e4MSN6IImpI http://vihart.com

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Doodling in Math Class: Infinity Elephants

By: Vi Hart

More videos/info: http://vihart.com/doodling Doodling Snakes + Graphs: http://www.youtube.com/watch?v=heKK95DAKms Doodling Stars: http://www.youtube.com/watch?v=CfJzrmS9UfY Doodling Binary Trees: http://www.youtube.com/watch?v=e4MSN6IImpI http://vihart.co

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Doodling in Math Class: Connecting Dots

By: Vi Hart

Anti-parabola propoganda, plus musing on math class, cardioids, connect the dots, envelopes of lines, even a bit of origami. Extra points to a certain Andrea whose line-enveloped Hilbert curve inspired me to finish this video.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Doodling in Math Class: Binary Trees

By: Vi Hart

Thank you to all the people I know whose math classes do not require such pastimes!

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Doodle Music

By: Vi Hart

A visual and musical expression of mathematical symmetry groups. The transformations done to the video are equivalent to the transformations done to the notes. These type of repeating patterns are called frieze patterns. A couple wallpaper groups are also

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Dialogue for 2

By: Vi Hart

A dialogue with the number 2, with special guest Brady Haran of Numberphile and other channels!

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Borromean Onion Rings

By: Vi Hart

Borromean Onion Rings, the perfect way to top your Green Bean Matherole! Borromean onion rings were invented by special guest Marc ten Bosch (http://marctenbosch.com). Also shown are gelatinous cranberry cylinder, bread spheres and butter prism, mathed po

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Binary Hand Dance

By: Vi Hart

Thanks to my bro for the music! He's at christopherhart2010@gmail.com Thanks to my other bro for hand dancin' and throwing money at me, and special thanks to my mamma and grandma for their guest appearances.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Are Shakespeare's Plays Encoded within Pi?

By: Vi Hart

Happy Pi Day! Also see: Pi is (still) Wrong: Pi in Binary Hand Dance. Special thanks to Toby (or not Toby) for playing Dog Hamlet. This cool website lets you search the first 200,000,000 digits of Pi. See if your phone number or encoded name is in there!

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : A Song About A Circle Constant

By: Vi Hart

Happy Tau Day! This is a song about Tau! Other Tau things you should see:Pi is (still) Wrong.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : 9.999... reasons that .999... = 1

By: Vi Hart

Point Nine Repeating Equals One! 9. 999. . . reasons in 9. 999. . . minutes. Bonus points if you can name all 9. 999. . . lords a-leaping. Dear YouTube, wouldn't it be nice if I could include the full script with this video? A larger character limit would

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Venn diagrams and the addition rule : Probability with Playing Car...

By: Sal Khan

Probability of compound events. The Addition Rule. Common Core Standard 457 S-CP. 7

Basics of probability and combinatorics. What is the probability of getting a diamond or an ace from a deck of cards? Well I could get a diamond that is not an ace, an ace that is not a diamond, or the ace of diamonds. This tutorial helps us think these t

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Venn diagrams and the addition rule : Addition Rule for Probability

By: Sal Khan

Venn diagrams and the addition rule for probability

Basics of probability and combinatorics. What is the probability of getting a diamond or an ace from a deck of cards? Well I could get a diamond that is not an ace, an ace that is not a diamond, or the ace of diamonds. This tutorial helps us think these t

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Vectors : Vector Examples

By: Sal Khan

Visually understanding basic vector operations

Let's get our feet (and probably the rest of our body) wet in thinking in terms of vectors and spaces.

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Vectors : Parametric Representations of Lines

By: Sal Khan

Parametric Representations of Lines in R2 and R3

Let's get our feet (and probably the rest of our body) wet in thinking in terms of vectors and spaces.

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Vectors : Introduction to Vectors

By: Sal Khan

Introduction to Vectors

Let's get our feet (and probably the rest of our body) wet in thinking in terms of vectors and spaces.

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Vector dot and cross products : Vector Triple Product Expansion (v...

By: Sal Khan

A shortcut for having to evaluate the cross product of three vectors

Let's get our feet (and probably the rest of our body) wet in thinking in terms of vectors and spaces.

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