Khan Academy
Area of a Circle, Perimeter, Area, and Volume, Geometry
This production, the second installment in a series of circles, demonstrates the process of finding the area of a circle. It is effective as an introductory tool. However, it needs to explain the reasoning behind the formula because that...
Curated OER
Binomial Theorem (Part 3)
In this video on the Binomial Theorem, Sal tries to give an intuition behind why combinations are part of its definition. By looking at the expansion of (a + b)3 and carefully looking at where each value originates from, one can see how...
Curated OER
Compound Interest and e (Part 2)
Sal continues to look at changing the length of compounding time, from daily to hourly compounding interest. Now he is able to show that compounding 100% annual interest converges on the number 2.71É or e as the number of compounding...
Curated OER
Conic Sections: Hyperbolas 2
Here is an example in this video of graphing a hyperbola centered at the origin. First, Sal shows solving for the equations of the asymptotes and then shows how to determine the direction of the hyperbola. He takes the approach of not...
Curated OER
Conic Sections: Hyperbolas 3
Continuing with the study of graphing hyperbolas, Sal shows an example of graphing a parabola that is centered at a point off the origin. By looking at the equation, first without shifting it, he helps listeners develop an intuitive...
Khan Academy
Parallel Lines From Equation, Mathematics I, High School Math
Here is a fairly basic video that uses three equations, each written in slope-intercept form, to determine whether the lines are parallel. Sal graphs each equation on the same coordinate plane to show how their slopes compare. The video...
California Academy of Science
Desalination
Desalination requires around two gallons of sea water to make one gallon of fresh water—that's quite a ratio! Viewers consider the pros and cons of desalination as one option to providing fresh water. They learn about two different...
California Academy of Science
How Do We Meet the Growing Need for Water?
Some aquifers took thousands of years to collect water, yet they have been depleted in only a hundred years. Viewers learn about where humans use water and the serious concerns for the future of the water supply in the second of 10...
Curated OER
Bonds Vs. Stocks
What's the difference between stocks and bonds? Sal illustrates this concept through explaining the two ways a company can raise capital: debt or equity. Drawing out a balance sheet, he categorizes stocks as equity and bonds as debt,...
Curated OER
Chapter 11: Bankruptcy Restructuring
Continuing from the last clip on liquidation, scholars explore another bankruptcy avenue: restructuring. Sal briefly touches on covenants with debt holders and goes into reasons a company would refrain from liquidating when facing...
Curated OER
Equity vs. Debt
Examine the two ways a company can raise capital: equity and debt. Sal breaks down the differences between these and the pros and cons of the investors. He explains the implications of having a publically traded company and draws a stock...
Curated OER
Going Back to the Till: Series B
Help young economists understand the concept of a company's increasing value despite a lack of profit. They explore Sal's case study startup company, which needs to raise more money after going through the original angel investment. For...
Curated OER
Housing Conundrum (Part 4)
The last of four videos, this clip explains why there were such low default rates at the beginning of the 21st century, and the effect this had on the market. Sal breaks down the options for a homeowner who can no longer pay a mortgage...
Curated OER
Housing Price Conundrum (Part 2)
This second of four videos starts with a short history of the housing market and the conditions that allowed some people to buy, when others could rent. These starting points are a great topic for students to discuss further before...
Curated OER
Housing Price Conundrum (Part 3)
Wondering why home financing relaxed in the years following Y2K? In the third of a four-part series, Sal describes the investment phenomenon between 2000 and 2006 that allowed more people to bid on homes and increased demand...
Curated OER
Inflation, Deflation & Capacity Utilization 2
Sal justifies that the determining factor of inflation and deflation is not the money supply as much as much as it is demand and the raised capacity utilization.
Curated OER
Inflation, Deflation & Capacity Utilization
High utilization of capacity leads to a raise in prices. Salman Khan discusses competition and its effect on inflation.
SciShow
Why We Age - And How We Can Stop It
As we get older, we age, our bodies and minds deteriorate, but this isn't true of all species. The video begins with why we age and what biological processes cause aging. Then it covers research on worms, mice, and other animals that...
California Academy of Science
Waste Water Recycling
What types of water qualify for recycling and how does the recycling process work? The eighth lesson in the 10-part series exploring Fresh Solutions presents both the financial and water savings associated with emerging recycling methods.
California Academy of Science
Recharging Aquifers
The ninth lesson in a 10-part series on Fresh Solutions explains how aquifers develop and how people currently use them. The video also explores how aquifers are being depleted faster than they refill and the long-term concerns about...
California Academy of Science
Water-Wise Farms
The seventh lesson on Fresh Solutions in the 10-part series addresses solutions implemented on farms. It focuses on the options currently in use and hopes for the future of water conservation and farming.
California Academy of Science
Vertical Farming
Half of crops from traditional farming never get harvested, while 90 percent of crops from vertical farming go into the food supply. As land runs out for farming and the need for crops increases, could vertical farming solve the problem?...
California Academy of Science
Renewable Energy: Powered by Poop
A single cow produces more than 100 pounds of manure every day. Meet a farmer using cow manure to provide energy to his farm, electric car, and the larger electric grid. He explains the process and benefits of the renewable energy source.
Into the Outdoors
Into the Outdoors: Technology of Soy
A video investigating the history of the soybean industry. Explore how Henry Ford developed industrial products to grow the soybean industry in the United States. Also included on the site is a lesson plan for teachers to use to view the...
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