1) discuss why knowledge is and always will be an incomplete endevour 2) why is paradigm shift common in social sciences?

Because of human's inherent skepticism. YOu can never have complete knowledge because there's always room for doubt. Due to the fact that your research is based on opinions and second-hand experiences (how do I know you feel pain the same way I do?).

#2 is a good question, hadn't really thought of that. Possibly because its a very loose science, more based on opinions on topics and personal experiences, rather than empirically proofs done in a lab. Social sciences have a large human factor.

They may use logical arguments, but weight is given to an argument/evidence depending on if it "feels right". Feelings change, laws of the universe don't. Or should I say shouldn't (in reference to question #1).