The Mining Act of 1872 allows mining companies to purchase land from the U.S. Government at 1872 prices - about $5.00 an acre! This video features the town of Crested Butte, Colorado, and a mountain just outside of town that was...

Your class has been exposed to the effects and ramifications of the recent financial crisis. In this video, Sal helps to clarify the terms and procedures of what has been happening. He uses a fictional balance sheet to illustrate the...

A series of videos about the role of the Federal Reserve in the US banking system.

A video explaining the Federal Reserves three major tasks that keep the American economy running. [2:30]

See how Aldosterone effects the principal cells of the kidney to raise BP and lower potassium. Rishi is a pediatric infectious disease physician and works at Khan Academy. [13:18]

Learn about how the arteries use nerve impulses to help regulate blood pressure. Rishi is a pediatric infectious disease physician and works at Khan Academy. [12:09]

Jeffrey Rosen of the National Constitution Center in conversation with Walter Isaacson of the Aspen Institute about Article I of the Constitution. [10:43]

The resource from Khan Academy and the Association of American Medical Colleges provides study content for the MCAT. This resource discusses the regulation of oxidative phosphorylation.

The resource from Khan Academy and the Association of American Medical Colleges provides study content for the MCAT. This resource discusses the regulation of pyruvate dehydrogenase.

This lesson will explain the process of homeostasis and how it allows organisms to maintain a stable internal environment. It is 2 of 10 in the series titled "Homeostasis."