In all human history a few important inventions have changed the way people work and live.  Among these key inventions are airplanes, automobiles, electric power, and personal computers.  Airplanes allowed people and products to move from city to city and county to county in only a few hours.  Automobiles allowed people to work and shop miles from where they lived.  Electric power allowed people to work and entertain at night as well as bringing out a host of new appliances such as refrigerators and air-conditioning. Continue reading →