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### Absolute value : Absolute Value and Number Lines

##### By: Sal Khan, Monterey Institute for Technology and Education

Absolute Value and Number Lines

Extending our understanding of numbers below 0. Thinking about absolute distance from 0.

##### By: Sal Khan

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

### Capacity utilization and inflation : Cupcake Economics 3

##### By: Sal Khan

Using our spreadsheet to show why prices decrease when utilization is low and prices increase when utilization is high.

This tutorial starts with a very micro view of when firms decide to raise (or lower prices). It then jumps back to the macro view to discuss how capacity utilization can impact prices.

### TEDx Projects Georgetown : Bobby Ghosh: Why global jihad is losing

##### By: Bobby Ghosh

The two annual TED conferences, in Long Beach/Palm Springs and Edinburgh, Scotland, bring together the world's most fascinating thinkers and doers, who are challenged to give the talk of their lives (in 18 minutes or less). TED Talks began as a simple attempt to share what happens at TED with the world. Under the moniker ideas worth spreading, talks were released online. They rapidly attracted a global audience in the millions. Indeed, the reaction was so enthusiastic th...

TED is a nonprofit devoted to Ideas Worth Spreading. It started out (in 1984) as a conference bringing together people from three worlds: Technology, Entertainment, Design. Since then its scope has become ever broader. Along with two annual conferences -- the TED Conference in Long Beach and Palm Springs each spring, and the TEDGlobal conference in Edinburgh UK each summer -- TED includes the award-winning TED Talks video site, the Open Translation Project and TED Conver...

### Homogeneous equations : First order homogeneous equations 2

##### By: Sal Khan

Another example of using substitution to solve a first order homogeneous differential equations.

Differential equations with only first derivatives.

### The convolution integral : Introduction to the Convolution

##### By: Sal Khan

Introduction to the Convolution

Transforms and the Laplace transform in particular. Convolution integrals.

### Line integrals for scalar functions : Introduction to the Line Int...

##### By: Sal Khan

Introduction to the Line Integral

Line integral of scalar and vector-valued functions. Green's theorem and 2-D divergence theorem.

##### By: Sal Khan

Intuition of the gradient of a scalar field (temperature in a room) in 3 dimensions.

Thinking about forms of derivatives in multi-dimensions and for vector-valued functions: partial derivatives, gradient, divergence and curl.

### TEDtalks Conference 2009 : Aimee Mullins: It's not fair having 12 ...

##### By: Aimee Mullins

The two annual TED conferences, in Long Beach/Palm Springs and Edinburgh, Scotland, bring together the world's most fascinating thinkers and doers, who are challenged to give the talk of their lives (in 18 minutes or less). TED Talks began as a simple attempt to share what happens at TED with the world. Under the moniker ideas worth spreading, talks were released online. They rapidly attracted a global audience in the millions. Indeed, the reaction was so enthusiastic th...

TED is a nonprofit devoted to Ideas Worth Spreading. It started out (in 1984) as a conference bringing together people from three worlds: Technology, Entertainment, Design. Since then its scope has become ever broader. Along with two annual conferences -- the TED Conference in Long Beach and Palm Springs each spring, and the TEDGlobal conference in Edinburgh UK each summer -- TED includes the award-winning TED Talks video site, the Open Translation Project and TED Conver...

### TEDtalks Conference 2010 : Adora Svitak: What adults can learn fro...

The two annual TED conferences, in Long Beach/Palm Springs and Edinburgh, Scotland, bring together the world's most fascinating thinkers and doers, who are challenged to give the talk of their lives (in 18 minutes or less). TED Talks began as a simple attempt to share what happens at TED with the world. Under the moniker ideas worth spreading, talks were released online. They rapidly attracted a global audience in the millions. Indeed, the reaction was so enthusiastic th...

TED is a nonprofit devoted to Ideas Worth Spreading. It started out (in 1984) as a conference bringing together people from three worlds: Technology, Entertainment, Design. Since then its scope has become ever broader. Along with two annual conferences -- the TED Conference in Long Beach and Palm Springs each spring, and the TEDGlobal conference in Edinburgh UK each summer -- TED includes the award-winning TED Talks video site, the Open Translation Project and TED Conver...

### TEDtalks Salon London Spring 2011 : Honor Harger: A history of the...

##### By: Honor Harger

The two annual TED conferences, in Long Beach/Palm Springs and Edinburgh, Scotland, bring together the world's most fascinating thinkers and doers, who are challenged to give the talk of their lives (in 18 minutes or less). TED Talks began as a simple attempt to share what happens at TED with the world. Under the moniker ideas worth spreading, talks were released online. They rapidly attracted a global audience in the millions. Indeed, the reaction was so enthusiastic th...

TED is a nonprofit devoted to Ideas Worth Spreading. It started out (in 1984) as a conference bringing together people from three worlds: Technology, Entertainment, Design. Since then its scope has become ever broader. Along with two annual conferences -- the TED Conference in Long Beach and Palm Springs each spring, and the TEDGlobal conference in Edinburgh UK each summer -- TED includes the award-winning TED Talks video site, the Open Translation Project and TED Conver...

### Momentum : 2-dimensional momentum problem

##### By: Sal Khan

An example of conservation of momentum in two dimensions.

Linear momentum. Conservation of momentum. Elastic collisions.

### Orthogonal complements : Unique rowspace solution to Ax=b

##### By: Sal Khan

Showing that, for any b that is in the column space of A, there is a unique member of the row space that is the smallest solution to Ax=b

We explore creating and moving between various coordinate systems.

### Acceleration : Why Distance is Area under Velocity-Time Line

##### By: Sal Khan

Understanding why distance is area under velocity-time line

In this tutorial we begin to explore ideas of velocity and acceleration. We do exciting things like throw things off of cliffs (far safer on paper than in real life) and see how high a ball will fly in the air.

### TEDx Projects Helvetia : Jonas Eliasson: How to solve traffic jams

##### By: Jonas Eliasson

The two annual TED conferences, in Long Beach/Palm Springs and Edinburgh, Scotland, bring together the world's most fascinating thinkers and doers, who are challenged to give the talk of their lives (in 18 minutes or less). TED Talks began as a simple attempt to share what happens at TED with the world. Under the moniker ideas worth spreading, talks were released online. They rapidly attracted a global audience in the millions. Indeed, the reaction was so enthusiastic th...

TED is a nonprofit devoted to Ideas Worth Spreading. It started out (in 1984) as a conference bringing together people from three worlds: Technology, Entertainment, Design. Since then its scope has become ever broader. Along with two annual conferences -- the TED Conference in Long Beach and Palm Springs each spring, and the TEDGlobal conference in Edinburgh UK each summer -- TED includes the award-winning TED Talks video site, the Open Translation Project and TED Conver...

### TEDtalks Medical Conference 2012 : Ben Goldacre: What doctors don'...

##### By: Ben Goldacre

The two annual TED conferences, in Long Beach/Palm Springs and Edinburgh, Scotland, bring together the world's most fascinating thinkers and doers, who are challenged to give the talk of their lives (in 18 minutes or less). TED Talks began as a simple attempt to share what happens at TED with the world. Under the moniker ideas worth spreading, talks were released online. They rapidly attracted a global audience in the millions. Indeed, the reaction was so enthusiastic th...

TED is a nonprofit devoted to Ideas Worth Spreading. It started out (in 1984) as a conference bringing together people from three worlds: Technology, Entertainment, Design. Since then its scope has become ever broader. Along with two annual conferences -- the TED Conference in Long Beach and Palm Springs each spring, and the TEDGlobal conference in Edinburgh UK each summer -- TED includes the award-winning TED Talks video site, the Open Translation Project and TED Conver...

### Circles : Parts of a Circle

##### By: Sal Khan, Monterey Institute for Technology and Education

Parts of a Circle

This is a first year, high-school level course on Geometry (which is based on Euclid's elements). It revisits many of the basic geometrical concepts studied in earlier courses, but addresses them with more mathematical rigor. There is strong focus on prov

### TEDtalks Conference, New York : Hannah Brencher: Love letters to s...

##### By: Hannah Brencher

The two annual TED conferences, in Long Beach/Palm Springs and Edinburgh, Scotland, bring together the world's most fascinating thinkers and doers, who are challenged to give the talk of their lives (in 18 minutes or less). TED Talks began as a simple attempt to share what happens at TED with the world. Under the moniker ideas worth spreading, talks were released online. They rapidly attracted a global audience in the millions. Indeed, the reaction was so enthusiastic th...

TED is a nonprofit devoted to Ideas Worth Spreading. It started out (in 1984) as a conference bringing together people from three worlds: Technology, Entertainment, Design. Since then its scope has become ever broader. Along with two annual conferences -- the TED Conference in Long Beach and Palm Springs each spring, and the TEDGlobal conference in Edinburgh UK each summer -- TED includes the award-winning TED Talks video site, the Open Translation Project and TED Conver...

### Flux in 3-D and constructing unit normal vectors to surface : Conc...

##### By: Sal Khan

Conceptual understanding of flux across a two-dimensional surface

Parameterizing a surface. Surface integrals. Stokes' theorem.

### Oxidation reduction : Introduction to Oxidation States

##### By: Sal Khan

Oxidation and reduction. Oxidation states.

Videos on chemistry (roughly covering a first-year high school or college course).

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