When two agents have differing opportunity costs, there is potential for both of the to benefit if they specialize in what they each have comparative advantage in. This video explores how two parties can get better outcomes by specializing in their comparative advantage and trading. Created by Sal Khan.

In this video we work through an example of a question like you might see on an AP microeconomics or AP Macroeconomics exam determining who has comparative advantage in producing a good using data from a table. Topics include how to calculate opportunity costs and determine who has comparative advantage based on opportunity cost.

A discussion with Khan Academy World History Fellow Eman Elshaikh on the comparative roles of women in Rome and Han China (with brief discussion of women in Athens as well).

Similarities and differences between the Roman Empire and the "Byzantine Empire" (which considered itself the continuation of the Roman Empire).

Analyzing charts from New York Times to compare income trends across several countries over a 30 year time period. Created by Sal Khan.

Comparison of the processes of mitosis and meiosis. Mitosis produces two diploid (2n) somatic cells that are genetically identical to each other and the original parent cell, whereas meiosis produces four haploid (n) gametes that are genetically unique from each other and the original parent (germ) cell. Mitosis involves one cell division, whereas meiosis involves two cell divisions.

Comparing what led to the rise of Achaemenid Persia, Maurya India, Han China, and the Roman Empire.

Seeing how an inhibitor can "compete" for an enzyme with the intended substrate.

Complex numbers can be represented three ways on the complex plane: cartesian coordinates, radius and angle, and exponential form. Created by Willy McAllister.

When using the expenditures approach to calculating GDP the components are consumption, investment, government spending, exports, and imports. In this video, we explore these components in more detail. Created by Sal Khan.

Crust, mantle, core, lithosphere, asthenosphere, mesosphere, outer core, inner core. Created by Sal Khan.

Learn about the basics of compound interest, with examples of basic compound interest calculations. Created by Sal Khan.

A concentration gradient occurs when the concentration of particles is higher in one area than another. In passive transport, particles will diffuse down a concentration gradient, from areas of higher concentration to areas of lower concentration, until they are evenly spaced.

Seeing how light energy can excite electrons which can be used to create ATP and NADPH (with oxygen as a byproduct).

We look at Confucianism, Daoism, and Legalism, as well as other philosophies from Warring States-era China.

Congressional oversight over the executive branch through committee hearings and power of the purse.

Connecting income to capital growth and potential inequality. A discussion with Sal Khan.