... ). Luckily, gasoline is not our only choice of fuel. Research of hydrogen has been occurring ever since the beginning of the 15th century when "Paracelsus noted that when iron reacts with sulfuric acid, "an air arises which bursts forth like the wind"" (McAlister 165). Presently, much effort has gone into researching hydrogen as an alternative fuel sources for automobiles. Not only is hydrogen ... the "cleanest fuel available" and creates "negligible emissions of air pollutants" when powering an internal combustion engine, but it has ... also been known to actually clean the air while a...

• Word Count: 1803
• Approx Pages: 7
• Has Bibliography
• Grade Level: Undergraduate

... hunter-gatherer ancestors had used to dig up edible roots and tubers, the farmers stirred up this virgin soil and planted their seeds. The new crop of grain would have grown magnificently, providing a rich harvest. But, inevitably, with the first forest growth gone, the decline in the soils fertility began again. Meanwhile the land that had been abandoned earlier would slowly grow up to bushes ... and trees. The trees would drop leaves and twigs onto the ground, where through the process of decay, they would deposit nourishing chemicals in the worn-out soil. Other refreshing and essentia...

• Word Count: 3974
• Approx Pages: 16
• Grade Level: Undergraduate

... and master under any circumstances. This suggested that the Mammy favored her situation and status as a slave. Why was slavery abolished if clearly the slaves were happy and even supported it? This representation of the Mammy persisted throughout the 20th century with films such as Imitation of Life and Gone with the Wind. Closely related to the Mammy was the character of the Sambo. The Sambo was a simple, docile and laughing black man ... who was carefree and irresponsible. He paved the way for the Jim Crow character first introduced by T.D. Rice ... ...

• Word Count: 1938
• Approx Pages: 8
• Has Bibliography
• Grade Level: Undergraduate