Three views of science
Logical positivists: researcher observes, finds something to explain - hypothesises about what is observed, tests the hypothesis. Verification!
Agree = scientific law
Disagree = amend, test until agreement!
Popper = falsification; don't try to prove something true - it's impossible to be 100% correct. BUT find one piece of evidence to contradict the hypothesis and you've proved it untrue. Cannot have absolute truth. All swans are white...or are they?
Kuhn = paradigms. Scientists make assumptions based on what is known (or assumed); progress happens when new information becomes so overwhelming it can't be ignored. Scientific revolutions - earth circling the sun etc.