Introduction to PCR (polymerase chain reaction).
Ponzi Schemes. Created by Sal Khan.
The higher the genetic diversity in a population, the more resilient the population is to environmental change. Created by Sal Khan.
Seeing that the formula for population growth rate based on birth and death rates given in AP Biology exams is actually quite intuitive.
Using position-time graphs and number lines to find displacement and distance traveled.
What happens when all of the benefits of consumption are not captured in a demand curve? In this video we explore how to think about positive externalities in a market setting. Created by Sal Khan.
How K-Ar dating can be used to date very old volcanic rock and the things that might be buried in between. Created by Sal Khan.
Work needed to compress a spring is the same as the potential energy stored in the compressed spring. Created by Sal Khan.
The Preamble is the introduction to the US Constitution, but it's so much more than that. In this video, Sal discusses the Preamble with Jeffrey Rosen, President and CEO of the National Constitution Center.
Clarifying the effect of axial precession on the calendar and the date of perihelion and aphelion. Created by Sal Khan.
Sal provides an overview of the population and civilizations in the Americas over the past sixteen thousand years.
What effect do interactions between species have on the sizes of the populations involved? Learn about the dynamics of predator and prey populations, and how they can influence one another’s patterns of growth and decline.
Tensions rise between Athens and Sparta. This leads to the Peloponnesian War.
More choices as to when you get your money. Created by Sal Khan.
What happens when we change the discount rate? Created by Sal Khan.
Discounted cash flows are a way of valuing a future stream of cash flows using a discount rate. In this video, we explore what is meant by a discount rate and how to calculated a discounted cash flow by expanding our analysis of present value. Created by Sal Khan.
An introduction to the informal power of presidential signing statements.
Sal explains the difference between liquids and gasses (both fluids). He then starts a calculation of the work done on a liquid in a U-shaped container. Created by Sal Khan.
Sal finishes the calculation of work to determine the mechanical advantage in a U-shaped tube. He also explains pressure and Pascal's Principle. Created by Sal Khan.
Sal derives the formula to determine the pressure at a specific depth in a fluid. Created by Sal Khan.