Read the Carnap section on scientific theories and answer the following questions in 500 words.
 
1. According to Carnap, what is the difference between an observable concept and a theoretical concept?
 
2. What is the difference between an empirical law and a theoretical law?
 
3. Why would science be limited if theoretical laws and concepts were not
allowed?
 
4. Do Newton's second law of motion or the theory of Darwinian evolution really 
"exist" in our world?  Is it the same existence as the existence of Antarctica or the 
existence of thermal expansion?  What are the differences in the types of existence? 
Are there other types of existence?