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what was the county unit system? how did it give an unfair advantage to rural counties? why was it eventually declared invalid?

The County Unit System was a voting system used by the U.S. state of Georgia to determine a victor in statewide primary elections from 1917 until 1962. ,In effect, the system of allotting votes by county, with little regard for population differences, allowed rural counties to control Georgia elections by minimizing the impact of the growing urban centers. don't know the  last one mate sorry 

Energy cannot be created or destroyed. This statement is known as law of conservation of energy, and it implies that whenever a certain form of energy does change, the loss of this form of energy must have converted into an another type of energy. A typical example is an object falling to the ground: initially, the object has gravitational potential energy. As the object falls down, it loses potential energy (since its altitude from the ground decreases), but it acquires kinetic energy (because its velocity increases). In this example, potential energy has converted into kinetic energy, but the total energy of the object has remained constant.