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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.

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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 : Thanksgiving Turduckenen-duckenen

By: Vi Hart

Forget turducken. . . I'm stuffing my turkey with two ducks, stuffed with four hens, stuffed with eight quail eggs. Honestly, I do not recommend trying this yourself. So what's your favourite naming scheme: breadth-first, depth-first, or inordered binary

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Snowflakes, Starflakes, and Swirlflakes

By: Vi Hart

Unusual variations on the paper snowflake.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Rhapsody on the Proof of Pi = 4

By: Vi Hart

Correction: when I mark where pi is on the graph, I meant pi/2! Note: If this video were supposed to be teaching you, I'd probably have to make it boring and say that in one sense of limits, spoiler alert, you actually do approach a circle and a line, sol

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Re: Visual Multiplication and 48/2(9+3)

By: Vi Hart

A quick response to some mathy things going around.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Origami Proof of the Pythagorean Theorem

By: Vi Hart

Leave your homework in the comments. Extra points for clarity and conciseness! Special thanks to my peeps at NYU where the idea for this video popped up during discussion.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Optimal Potatoes

By: Vi Hart

With Thanksgiving just around the corner here in the US, it is important to know how to arrange mathed potatoes on your plate for maximum gravy. Also shown are bread spheres, butter prism, and gelatinous cranberry cylinder. Mathed Potatoes, Green Bean Mat

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Open Letter to Nickelodeon, Re: SpongeBob's Pineapple un...

By: Vi Hart

SpongeBob background designer's response: OK, I guess the jig is up. . . I'm tired of living a lie. See his full message and pineapple redesign

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Mobius Story: Wind and Mr. Ug

By: Vi Hart

A cautionary tale. Other Mobius videos: Candy Buttons Flatland This is the book you should get if you want to know all things Möbius: This story was inspired by the novel Flatland: There's a pretty cool movie version.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Math Improv: Fruit by the Foot

By: Vi Hart

Playing mathematically with fruits by the foot. Mobius Story, Wind and Mr. Ug: http://www.youtube.com/watch?v=4mdEsouIXGM Mobius Candy buttons: http://www.youtube.com/watch?v=OOLIB3cjFqw Mobius Music box: http://www.youtube.com/watch?v=3iMI_uOM_fY Doodlin

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : How To Snakes

By: Vi Hart

Snakes! Snakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakesnakes. me: vihart.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Hexaflexagons 2

By: Vi Hart

This video is based on, and in honor of, Martin Gardner's column from 1956, Hexaflexagons, which can be found here: http://maa.org/pubs/focus/Gardner_Hexaflexagons12_1956.pdf.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Hexaflexagons

By: Vi Hart

Hooraaaay flexagons! Next hexaflexagon video in one week. Happy October!More info coming soon.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Hexaflexagon Safety Guide

By: Vi Hart

Don't let a flexigatastrophe happen to you! Happy Hexaflexagon Month, in honor of Martin Gardner. Yes, we've been encouraging recreational use of hexaflexagons and even hexaflexagon parties to happen on Oct. 21, but be sure to flex responsibly. This is my

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Green Bean Matherole

By: Vi Hart

This Thanksgiving, make sure your table isn't missing the all-important green bean matherole. Pick your favorite vector field and have at it! Mathed Potatoes, Green Bean Matherole, Turduckenen-duckenen

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Fractal Fractions

By: Vi Hart

How to make snazzy-lookin' fractal equations using simple algebra.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Flex Mex

By: Vi Hart

Might as well.

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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

By: Vi Hart

Part 1: http://youtu. be/ahXIMUkSXX0 Part 2: http://youtu. be/lOIP_Z_-0Hs How to find the Lucas Angle: http://youtu. be/RRNQAaTVa_A References: Only good article I could find on the subject: http://www.sciencenews. org/view/generic/id/8479/title/Math_Trek

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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

By: Vi Hart

Part 2: http://youtu. be/lOIP_Z_-0Hs Part 3: http://youtu. be/14-NdQwKz9w Re: Pineapple under the Sea: http://youtu. be/gBxeju8dMho

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Doodling in Math: Sick Number Games

By: Vi Hart

I don't even know if this makes sense. Boo cold. http://en. wikipedia. org/wiki/Ulam_spiral Doodling in Math Class videos: http://vihart.com/doodling

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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Vi Hart : Doodling in Math Class: Triangle Party

By: Vi Hart

Triangles!

Recreational mathematics and inspirational videos by resident mathemusician Vi Hart

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