The trite example I listed _is_ obvious, yet as obvious as it is, some folks insist that “science” is this free thinking process.
Foucault of course is much more expansive than my trivial example, covering the notion of institutions as ideological enforcement, among other things.
No fool on Hacker News can summarize his work in a reply, and one would be heavily encouraged to read it. It cuts right to the core of epistemology itself.