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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.

 
book cover
Title:   Worked Examples : Interesting Perimeter and Area Problems
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Worked Examples series
Language:   English
Date:  
Subjects:   Math, Geometry, Worked Examples
Collections:   Educational Videos, Worked Examples series
Book Id:   WPLBN0002825947
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Worked Examples : Challenging Perimeter Problem
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Worked Examples series
Language:   English
Date:  
Subjects:   Math, Geometry, Worked Examples
Collections:   Educational Videos, Worked Examples series
Book Id:   WPLBN0002825946
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Work and energy : Work/Energy problem with Friction
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Physics series
Language:   English
Date:  
Subjects:   Science, Science & Economics, Physics
Collections:   Educational Videos, Work and energy series
Book Id:   WPLBN0002825945
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Work and energy : Work and Energy (part 2)
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Physics series
Language:   English
Date:  
Subjects:   Science, Science & Economics, Physics
Collections:   Educational Videos, Work and energy series
Book Id:   WPLBN0002825944
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Work and energy : Introduction to work and energy
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Physics series
Language:   English
Date:  
Subjects:   Science, Science & Economics, Physics
Collections:   Educational Videos, Work and energy series
Book Id:   WPLBN0002825943
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Work and energy : Conservation of Energy
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Physics series
Language:   English
Date:  
Subjects:   Science, Science & Economics, Physics
Collections:   Educational Videos, Work and energy series
Book Id:   WPLBN0002825942
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Why parties in a cartel will cheat : Why Parties to Cartels Cheat
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Microeconomics series
Language:   English
Date:  
Subjects:   Science, Science & Economics, Microeconomics
Collections:   Educational Videos, Why parties in a cartel will cheat series
Book Id:   WPLBN0002825941
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Why parties in a cartel will cheat : Game Theory of Cheating Firms
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Microeconomics series
Language:   English
Date:  
Subjects:   Science, Science & Economics, Microeconomics
Collections:   Educational Videos, Why parties in a cartel will cheat series
Book Id:   WPLBN0002825940
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   What drives oil prices : Short-Run Oil Prices
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Microeconomics series
Language:   English
Date:  
Subjects:   Science, Science & Economics, Microeconomics
Collections:   Educational Videos, What drives oil prices series
Book Id:   WPLBN0002825939
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   What drives oil prices : Breakdown of Gas Prices
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Microeconomics series
Language:   English
Date:  
Subjects:   Science, Science & Economics, Microeconomics
Collections:   Educational Videos, What drives oil prices series
Book Id:   WPLBN0002825938
Format Type:   Video (Education Video)
Average Rating:   (15)
 
book cover
Title:   Waves and optics : When the source and the wave move at the same velocity
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Science & Economics series
Language:   English
Date:  
Subjects:   Physics, Science & Economics, Physics
Collections:   Educational Videos, Waves and optics series
Book Id:   WPLBN0002825937
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Waves and optics : Virtual Image
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Science & Economics series
Language:   English
Date:  
Subjects:   Physics, Science & Economics, Physics
Collections:   Educational Videos, Waves and optics series
Book Id:   WPLBN0002825936
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Waves and optics : Total Internal Reflection
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Science & Economics series
Language:   English
Date:  
Subjects:   Physics, Science & Economics, Physics
Collections:   Educational Videos, Waves and optics series
Book Id:   WPLBN0002825935
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Waves and optics : Specular and Diffuse Reflection 2
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Science & Economics series
Language:   English
Date:  
Subjects:   Physics, Science & Economics, Physics
Collections:   Educational Videos, Waves and optics series
Book Id:   WPLBN0002825934
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Waves and optics : Specular and Diffuse Reflection
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Science & Economics series
Language:   English
Date:  
Subjects:   Physics, Science & Economics, Physics
Collections:   Educational Videos, Waves and optics series
Book Id:   WPLBN0002825933
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Waves and optics : Snell's Law Example 2
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Science & Economics series
Language:   English
Date:  
Subjects:   Physics, Science & Economics, Physics
Collections:   Educational Videos, Waves and optics series
Book Id:   WPLBN0002825932
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Waves and optics : Snell's Law Example 1
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Science & Economics series
Language:   English
Date:  
Subjects:   Physics, Science & Economics, Physics
Collections:   Educational Videos, Waves and optics series
Book Id:   WPLBN0002825931
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Waves and optics : Refraction in Water
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Science & Economics series
Language:   English
Date:  
Subjects:   Physics, Science & Economics, Physics
Collections:   Educational Videos, Waves and optics series
Book Id:   WPLBN0002825930
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Waves and optics : Refraction and Snell's Law
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Science & Economics series
Language:   English
Date:  
Subjects:   Physics, Science & Economics, Physics
Collections:   Educational Videos, Waves and optics series
Book Id:   WPLBN0002825929
Format Type:   Video (Education Video)
Average Rating:   (0)
 
book cover
Title:   Waves and optics : Parabolic Mirrors and Real Images
Author:   Sal Khan
Publisher:   Khan Academy
Volume:  Science & Economics series
Language:   English
Date:  
Subjects:   Physics, Science & Economics, Physics
Collections:   Educational Videos, Waves and optics series
Book Id:   WPLBN0002825928
Format Type:   Video (Education Video)
Average Rating:   (0)
 
 
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