Leibniz made a machine that could also multiply and worked on a system of dials and gears. ... Babbage's first attempt at solving this problem was made in 1822 when he made a machine to calculate differential equations called a Difference Engine. ... One of them was Vannevar Bush (1890 - 1974) who developed a calculator for solving differential equation in 1931. The machine could solve complex differential equations but it was cumbersome due to its hundreds of gears and shafts in order to represent numbers and their relationships. ... This approach would not have existed if it wasn&#x...

• Word Count: 2409
• Approx Pages: 10
• Grade Level: High School

Do not illegal aliens have an effect on our society, the economy, the welfare system and even the countries from which they emigrate? ... As soon as an unplanned variable enters the equation even the best plans will be severely challenged if not fail. ... How do we do this with the illegal alien problem in the equation? ... While most efforts to halt illegal immigration have focused on our southern land border, the difficulties are spread throughout the immigration system. ...

• Word Count: 2323
• Approx Pages: 9

The factor that changes in the equation above is the presence of a man. ... Armed citizens pose a risk of punishment to criminals - perhaps more so than does the criminal justice system. Gun ownership may exert as much deterrent effect on violent crime and burglary as the criminal justice system does. ...

• Word Count: 5482
• Approx Pages: 22
• Grade Level: High School