How is self-government doing today? why can't we have a good and self- government simultaneously? what are some ways we've succeeded and failed with self-government? and where do we go from here? what changes do we need to make in order to increase likelihood of success?

Define production possibility curve

Is it true the ancient egyptians created a calendar that had 10 days in a week

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.