Survivors: The Oxygen Revolution
At one time, Earth's atmosphere had a far smaller percentage of oxygen than it does today. Only when that percentage began to rise, thanks to the oxygen production of photosynthetic plants and organisms, was it possible ..
Sustaining the Earth: Case Study: Eco-Village
An examination of a sustainable community called Eco-Village in Ithaca, New York. This community strives to create a human habitat more in harmony with natural processes in which a sustainable lifestyle can be achieved i..
Sustaining the Earth: Case Study: Industrial Symbiosis
An examination of a symbiotic industrial arrangement among four industries in Denmark in which the wastes from one industry provide the raw materials for another. This kind of planned cradle to grave management of resour..
System of Two Equations Defined
Definition of a system of equations.
System of Two Equations: A Revenue Graph and a Cost Graph
Using a system of equations to plot a business's break-even point.
Table of Solutions for Equation with Two Variables
Constructing an equation with two variables and using a table to help solve it.
Taking the Offensive: Bombing of Hiroshima and Nagasaki, The
Different alternatives are available to ending the war in the Pacific. Truman's decision to bomb Hiroshima and Nagasaki is still being debated. Harvard historian Akira Iriye talks about the shock of the bombing, the Sovi..
Taking the Offensive: Election of 1944, The
The election of 1944 hinges more on the potential for world peace than domestic reform. Roosevelt abandons many New Deal policies and replaces controversial vice-president Henry Wallace with Senator Harry S. Truman from ..
Taking the Offensive: Focus of War Shifts to Asian Theater
After Germany surrenders in 1944, the war focus shifts to the Pacific. The United States gain victories in Japan, surrounding islands, and in the Philippine Islands. The Special Division that negotiates the exchange of p..
Taking the Offensive: Liberation of France; Germany's Surrender, The
By mid 1943, the United States and its allies begin to slow the Nazi Advance. England witnesses a gathering of 3 million troops in preparation of a major advance off the Normandy Coast of France. Generally known as D-Day..