A fraction of that energy reaches the earth. The fraction of the energy from the sun that reaches the earth in just one day is still more than enough to cover the energy use of the world in a whole year. ... Solar design, better insulation, and more efficient appliances could reduce this demand by 60 to 80 percent. ... This is just how conventional refrigerators and air conditioners work. ... Solar cells are made of materials that directly convert light into electricity. ...

• Word Count: 917
• Approx Pages: 4

Each day, they must decide how many cups of lemonade to prepare, how much money to charge for each cup, and how much to spend on advertising. ... Then they use formulas that include complex fractions and large exponents to calculate the monthly payments on their virtual dream car. ... In the unit's math lessons, students calculate commissions and odds, compare price-to-earnings ratios, use fractions and decimals, graph the results of various investment strategies, and more. ... How do you get what you want? ... Students access real weather data, learn about the Fahrenheit and Celsius te...

• Word Count: 6364
• Approx Pages: 25
• Grade Level: High School

Preventing Spills The U.S. oil and natural gas industry supplies more than 65 percent of America's energy. ... The viscosity of the oil affects how fast it disperses. ... Only a few components in oil are soluble in water, so dissolution involves only a small fraction of oil. ... This water-in-oil emulsion may be 50-80 percent water and thus increases the volume of the oil spilled. ... When bacteria consume oil, they convert it into more soluble, oxidized products and eventually to carbon dioxide and water. ...

• Word Count: 1417
• Approx Pages: 6
• Grade Level: High School

This issue prompted me to research ways to reduce global warming. ... To put it into terms a little easier to understand, assuming we could efficiently convert approximately 0.0014 percent of the sunlight that hits the earth on an average day, we could power the United States for a whole day with solar energy collected by the indirect photovoltaic system, also known as solar panels placed in a spot where they receive sunlight convert it into usable energy. ... "(Bortman) Although, I see photovoltaic systems as being in the beginning stages, I know it will be a breakthrough that will revolution...

• Word Count: 3689
• Approx Pages: 15
• Has Bibliography
• Grade Level: Undergraduate

Despite calling for a twenty-five percent reduction in federal spending, a balanced federal budget, a stable gold currency, and the removal of government from areas where private enterprise would be best suited President Franklin Roosevelt accomplished neither. ...

• Word Count: 7038
• Approx Pages: 28
• Grade Level: Undergraduate

The scientific revelations, due to scientific devices installed on rockets, balloons, and satellites in the late 1940's through the early 1960's produced enough interest to indicate how much there was to discover in space. ... In 1975 the European Space Agency joins the project, and the size of the telescope is reduced to 2.4 meters. ... Scientist believe that the finding of Boron may lead to understanding events during the birth of our own galaxy and it may alter some information to the Big Bang theory of how the universe was formed. ...

• Word Count: 3931
• Approx Pages: 16