Learn about the adjective order of Standard American English and your new favorite memory aid: DOSA-SCOMP.
Explore the mechanics of adjustable rate mortgages (ARM) in this video, including how they work and in what situation an ARM might be advantageous and when it might work against you.
Paige and David talk about using apostrophes to show that something belongs to multiple people.
TL;DW: affect's a verb and effect's a noun. But there's a little more to it than that.
What affirmative action is in the United States and major legal cases and initiatives surrounding it. Coverage of Regents of the University of California v. Bakke, Grutter v. Bollinger, and Proposition 209 in California.
We've learned about demand for a good or service, but aggregate demand is different: its the demand for everything bought in an economy. In this video, we discuss how aggregate demand (AD) is different from demand and why aggregate demand is downward sloping. Created by Sal Khan.
Thinking about how we get Calories from the land limits human population densities. Created by Sal Khan.
How long of a runway does an A380 need? Created by Sal Khan.
Figuring how long it takes an A380 to take off given a constant acceleration. Created by Sal Khan.
Alcohol or ethanol fermentation, including yeast and its role in bread and wine production.
How did Alexander the Great take over Persia? Sal explains.
Alexander the Great takes power.
This site teaches Arithmetic with Polynomials and Rational Expressions to High Schoolers through a series of 4333 questions and interactive activities aligned to 26 Common Core mathematics skills.
This site teaches High Schoolers how to create equations through a series of 298 questions and interactive activities aligned to 5 Common Core mathematics skills.
This site teaches Reasoning with Equations and Inequalities to High Schoolers through a series of 5909 questions and interactive activities aligned to 36 Common Core mathematics skills.
This site teaches Structure in Algebraic Expressions to High Schoolers through a series of 3482 questions and interactive activities aligned to 26 Common Core mathematics skills.
The properties of organic molecules depend on the structure, and knowing the names of organic compounds allow us to communicate with other chemists. We'll be learning about different aspects of molecular structure, including common functional groups and conformations.
Allele frequencies in populations and how they differ from genotype frequencies. Created by Sal Khan.
A gene as a stretch of DNA on a chromosome. Alleles as versions (sequence variants) of a gene.
There are a number of European alliances that contributed to the broad scope of World War I. Prominent among these are the 1839 Treaty of London, which promised that the United Kingdom would protect Belgium's neutrality, the 1879 Dual Alliance treaty between Germany and Austria-Hungary to protect each other in the event of Russian attack, the 1892 Franco-Russian Military Convention that promised mutual assistance in the face of attack, the Triple Entente linking the United Kingdom and France (and later Italy), and the Triple Alliance linking Germany, Austria-Hungary, and Italy (at first). Created by Sal Khan.