This 9-minute video lesson looks at why housing prices went up so much from 2000-2006 even though classical supply/demand would not have called for it. [Core Finance playlist: Lesson 13 of 184]

This 10-minute video lesson discusses why lending standards become more and more lax from 2000 to 2006. [Core Finance playlist: Lesson 15 of 184]

This 4-minute video lesson explains how the velocity of money can drive price increases. [Core Finance playlist: Lesson 169 of 184]

This 11-minute video lesson explains how bubbles destroy wealth. [Core Finance playlist: Lesson 42 of 184]

This 11-minute video lesson continues to look at how bubbles destroy wealth. [Core Finance playlist: Lesson 43 of 184]

This 14-minute video lesson discusses what it means to buy a company's stock. [Core Finance playlist: Lesson 17 of 184]

This 12-minute video lesson looks at alternate bailout plans and considers their moral hazard. [Financial Bailout playlist: Lesson 10 of 15]

This 11-minute video lesson is the first in Kahn's Financial Bailout series. It provides a review of balance sheets and explains the difference between illiquidity and insolvency. [Financial Bailout playlist: Lesson 1 of 15]

This 11-minute video lesson looks at a hypothetical bank balance sheet and explains what book value means. [Financial Bailout playlist: Lesson 2 of 15]

This 11-minute video lesson explains what it means when the market value of a stock is different from its book value. [Financial Bailout playlist: Lesson 3 of 15]

This 11-minute video lesson explains the different ways of accounting for an asset. It considers the mark-to-model vs. mark-to-market. [Financial Bailout playlist: Lesson 4 of 15]

This 11-minute video lesson looks at how the bank can liquidate assets to pay off debt that comes due. [Financial Bailout playlist: Lesson 5 of 15]

This 12-minute video lesson looks at how the bank gets bailed out by an equity infusion from a sovereign wealth fund. [Financial Bailout playlist: Lesson 6 of 15]

This 10-mintue video lesson looks at what happens when there is no equity infusion and the bank goes in to bankruptcy. [Financial Bailout playlist: Lesson 7 of 15]

This 12-minute video lesson looks at how the banks are connected and what happens when one bank fails. [Financial Bailout playlist: Lesson 8 of 15]

In this 11-minute video lesson Kahn considers what Paulson wants to do and explains why he does not like it. [Financial Bailout playlist: Lesson 9 of 15]

Khan Academy tutorial video that uses Excel spreadsheet and actual income data to predict annual income and expresses why lines and models are useful and interesting.

This geometry lesson shows that that an inscribed angle is half of a central angle that subtends the same arc. [Geometry playlist: Lesson 24 of 31]

Although mom controls the oxygen source, the fetus has a couple of clever tricks to get the most oxygen possible! Rishi is a pediatric infectious disease physician and works at Khan Academy.