Mitosis is how cells divide! Learn what happens in all the phases of mitosis: prophase, metaphase, anaphase, and telophase.

Moderate amounts of inflation are common in healthy economies, so some inflation may actually be a good sign. Learn why in this video. Created by Sal Khan.

Two example items (from NY Regents exams) using molecular evidence to think about how closely related different species are.

Understanding how a triglyceride (triacylglycerol) can be formed from a glycerol molecule and three fatty acids.

A simple conservation of momentum problem involving an ice skater and a ball. Created by Sal Khan.

Monetary policy is the use of the money supply to affect key macroeconomic variables, such as real GDP. This video focuses on how a central bank can use open market operations and reserve requirements to enact monetary policy to close output gaps.

Most people assume that the government prints money, and that is how money is created. That is not entirely true. Watch this video to find out the role that banks play in the creation of the money supply.

In this video, learn about the two measures of money that are part of the money supply: M1 and M2. Topics include what is included in M1 and M2 and the monetary base (which is sometimes called M0). Created by Sal Khan.

Examples showing how various factors can affect interest rates. Created by Sal Khan.

Learn about the key differences between the two extremes of competition: monopolies and perfect competition.

In this video we explore why it is hard for a monopolistic competitor to make economic profit in the long run. Created by Sal Khan.

A monopolist might be pretty happy about its extraordinary profits, but these come at a cost for society. In this video we explore the welfare implications of a monopoly market. Created by Sal Khan.

A monopolist's marginal revenue curve is always less than its demand curve. We explore why using a numerical example in this video. Created by Sal Khan.

In this video we explore how a monopolist decides on the best quantity to produce and the price to charge for that quantity. Created by Sal Khan.

Price discrimination is charging each consumer their entire willingness to pay. What if a monopolist can charge each buyer their entire willingness to pay? Learn about the effect of perfect price discrimination on output and deadweight loss in this video.

We've learned in previous lessons that a price control decreases quantity and efficiency, but is that always the case? Learn about the surprising effect of a minimum wage on a monopsonistic labor market in this video.

In the Treaty of Versailles, the Allies punished Germany for the war. Created by Sal Khan.