The McGraw Hill Companies,Inc. One historian believes that progress, during the course of human history, has occurred during three periods that were isolated by much longer periods of time in which nothing of any importance to future generations occurred.
Work has a very special meaning to a physicist.
When any mass is lifted any distance, the physicist says that work has been done. The amount of work done does not depend on the path that the mass takes in moving this distance. In scientific research, disappointments are not the exception, but the rule. Not only were the Romans undemocratic, but at no period of its history did Rome love equality. In the Roman Republic, rank was determined by wealth.