2015: I have a gut feeling about something. I find a way to measure it. The measurement seems to prove that my gut feeling was wrong. Therefore I decide that my gut feeling was wrong.

2025: I have a gut feeling about something. I find a way to measure it. The measurement seems to prove that my gut feeling was wrong. Therefore I decide that there is something wrong with the way I measured and I must keep looking.

Duhem’s problem: if there is a conflict between theory and experience, it is not immediately obvious which is falsified, because an error in the old theoretical interpretation does not immediately produce a new one.