The theory of how mitochondria, chloroplasts and other membrane-bound organelles in eukaryotic cell likely arose from a symbiosis between aerobic prokaryotes and host anaerobic eukaryotic ancestors. Developed by Lynn Margulis.
Sal graphs elastic potential energy and kinetic energy for a mass on a spring and compares the total energy when with and without dissipative forces (friction).
Thinking about energy consumption for tilling land. Created by Sal Khan.
England didn't start its first successful colony in North America until 1607, more than 100 years after Columbus arrived in the New World. In this video, Kim discusses the problems that prevented England from following in Spain's footsteps, including struggles for the throne, war in Ireland, and economic depression.
Solving the P/E conundrum by looking at a different valuation metric (enterprise value). Created by Sal Khan.
Enumerated and implied powers of the US federal government with a focus on the Commerce Clause and the Necessary and Proper Clause of the US Constitution.
Exploring the relationship between pH and enzyme activity.
Enzymes as catalysts for reactions in biological systems; discussion of substrates, active sites, induced fit, and activation energy.
David explains the equation that represents the motion of a simple harmonic oscillator and solves an example problem. Created by David SantoPietro.
Total surplus is maximized in a market at equilibrium. In this video, we talk about why this is and the math behind this assertion.
How are nominal real interest rates determined? In the money market! Learn about the money market in this video.
Debt vs. Equity. Market Capitalization, Asset Value, and Enterprise Value. Created by Sal Khan.
Escrow is a way of holding monies in a third-party account until all of the necessary aspects of a transaction have been carried out. In this video, learn about the role of escrow in real estate transactions, how escrow accounts work, and what an escrow agent is.
Overview of the estate tax. Created by Sal Khan.
A cosine wave emerges from Euler's Formula. Music, no narration. Animated with d3.js. Created by Willy McAllister.
Euler's formula relates the complex exponential to the cosine and sine functions. This formula is the most important tool in AC analysis. It is why electrical engineers need to understand complex numbers. Created by Willy McAllister.
A sine wave emerges from Euler's Formula. Music, no narration. Animated with d3.js. Created by Willy McAllister.
An overview of the different types of evidence that support evolution, including homologous and analogous features and vestigial structures.
Evolution of political parties in picking candidates and voter mobilization.
A hairy resistance problem. Created by Sal Khan.