Determining how fast something will be traveling upon impact when it is released from a given height. Created by Sal Khan.

Overview of what Impeachment is and how it works in the United States.

Discussion of the properties of water that make it essential to life as we know it: polarity, "universal" solvent, high heat capacity, high heat of vaporization, cohesion, adhesion and lower density when frozen.

An overview of the Inca Empire, or Tawantinsuyu, founded by Pachacuti from the Kingdom of Cusco. The Mit'a system and eventual conquest by Pizarro.

Figuring out the components of the force due to gravity that are parallel and perpendicular to the surface of an inclined plane. Created by Sal Khan.

In this video we explore an alternative method of calculating GDP: the income approach. The intuition behind the income approach is pretty straightforward because every time you spend money, that spending is someone else's income. Learn more about the income approach and its categories: wages, interest, rent, and profit. Created by Sal Khan.

Elasticities can be calculated for more than just price elasticity of supply or price elasticity of demand. For example, income elasticity of demand as a measure of how quantity demanded changes in response to income.

John Dickerson shares his views about the importance of the Supreme Court today, when it makes more decisions that affect Americans' lives than ever. John Dickerson is co-host of CBS This Morning. He was previously CBS News' Chief Washington Correspondent, Political Director and anchor of Face The Nation. Dickerson is also a contributor to Slate's Political Gabfest and to The Atlantic. During the 2016 presidential campaign, Dickerson moderated CBS News' two presidential debates. Prior to CBS, Dickerson was Slate Magazine's Chief Political correspondent and covered politics for twelve years for Time magazine.

When there are increasing opportunity costs, the shape of the production possibilities curve (PPC) is bowed out. Learn more about how the shape of the PPC, which is sometimes also called the production possibilities frontier curve (PPF), depends on opportunity cost in this video. Created by Sal Khan.

"A compromise is a little something to make both sides angry." Kim and Sal talk about increased tensions between slave and free states as new territory is added after Mexican-American War and from Compromise of 1850 (especially the Fugitive Slave Act).

Anti-colonial independence movement in places like India, Algeria, Nigeria gain momentum and prove successful in the 20th Century, especially after the end of World War II. The non-alignment movement.

We can graph how we value tradeoffs between two goods. Created by Sal Khan.

Sal determines the current and EMF induced in a wire pulled through a magnetic field. Created by Sal Khan.

The Indus River Valley (or Harappan) civilization lasted for 2,000 years, and extended from what is today northeast Afghanistan to Pakistan and northwest India. Sal explores the history of this civilization, its technological innovations, its art, its architectural practices, and its agriculture.

Thinking about how the Industrial Revolution(s) and capitalism helped catalyze far-flung imperialism during the 1800s.

The concepts of normal goods and inferior goods can be tricky, and the definitions can be somewhat subjective as well. In this video, we take a deeper look at these kinds of goods. Created by Sal Khan.

Much of statistics is based upon using data from a random sample that is representative of the population at large. From that sample mean, we can infer things about the greater population mean. We'll explain.

Is the stimulus large enough to offset the demand shock caused by the contraction in credit? Will it lead to inflation? Created by Sal Khan.