A series of independence movements in the Americas in the late 1700s and early 1800s are sparked by the Enlightenment and conflict in Europe. This includes revolutions that will lead to the United States, Haiti, Mexico, Venezuela, Columbia, Panama, Bolivia, Peru, Equador, Paraguay, Uruguay, Brazil and Argentina.

Sal discusses how energy can't be created or destroyed in an isolated system, and works an example of how energy is transformed when a ball falls toward the Earth.

The law of demand states that as the price of a good decreases, the quantity demanded of that good increases. In other words, the law of demand states that the demand curve, as a function of price and quantity, is always downward sloping. In this video, we explore the law of demand and its implications for graphing demand curves. Created by Sal Khan.

In this video we explore the law of supply which states that quantity supplied increases as price increases. We use a supply schedule to describe the quantities a seller is willing to sell at different prices, and then translate the supply schedule into a supply curve that illustrates the law of supply. Created by Sal Khan.

LeBron James asks Sal Khan about which muscles we use when we shoot a basket. Created by Sal Khan and LeBron James.

Roles of DNA polymerase, primase, ligase, helicase and topoisomerase in DNA replication. An explanation of leading and lagging strands.

Lenz's Law - seeing that the magnetic field induced by a current induced by a change in magnetic flux (Faraday's Law) counteracts the change in flux.

Overview of early 19th century French history and context for Les Miserables. Created by Sal Khan.

A close reading of Martin Luther King, Jr.'s "Letter from a Birmingham Jail."

How do organisms use different life history strategies to maximize fitness? Learn about different ways that different species allocate energy and other resources between growth, maintenance/survival, and reproduction.

GDP is the most commonly used measure of output, but it leaves some things out. Learn about the limitations of GDP in this video.

Linear velocity from the radius and angular velocity for two pumpkin catapults with different arm lengths.

Thinking about how real GDP can drive real interest rates. Created by Sal Khan.

How do savers and borrowers find each other? In the market for loanable funds! In this video, learn how the demand of loanable funds and the supply of loanable funds interact to determine real interest rates.

We claim that aggregate supply is not responsive to changes in the price level in the long run, leading to a vertical long-run aggregate supply (LRAS) curve, but why? In this video we explore why aggregate supply may not be influenced by prices in the long-run. Created by Sal Khan.

In this video we explore the long run average total cost curve and how average costs vary when all inputs can be adjusted.

In this video, we compare and contrast the long run outcomes for monopolistic competition, monopolies, and perfect competition.