1. A historical example would be hand-washing for doctors. A contemporary example would be forensic science, which is filled with junk. Hair analysis, bite mark analysis, eye-witness testimony as a gold standard, etc. Tons of BS.
If you're interested in politics and psychology, frame manipulation. It is fundamental to modern political propaganda. Here's one
articles on the subject and a a fun video about push polling
If you're interested in propaganda posters
(which kind of rule), you could probably put together a selection representing techniques from a list like this
along with some historical/cultural/political context.
4. Psychology of Intelligence Analysis
). It's a CIA publication on, "helping analysts compensate for the human mind’s limitations in dealing with complex problems that typically involve ambiguous information, multiple players, and fluid circumstances." It overlaps nicely with Skepticism's emphasis on deftly navigating fallacies and biases.
And this sounds like an interesting project! Please feel free to post about what you end up putting together