Why does Kuhn think that scientific revolutions occur, and why does he think they are necessary?

Why does Kuhn think that scientific revolutions occur, and why does he think they are necessary? Order Description 2.What guides theory choice? Answer with reference to the writings seen in the course 3. Are scientific facts 'objective'? Define and explain with reference to the readings 4. Do social factors affect the content of science or merely its production? there are the other topics