(1) Brandoulli principle The amount of energy required to refute bullshit is an order of magnitude that which is required to create the bullshit

(2) Goodhart's Law Once a measure becomes a target, it ceases to be a good measure

(3) Mean experienced class size

• Most students surveyed by you would complain that their class has more students than the average class size advertised
• You are comparing "mean class size" to "mean experienced class size"
• This is susceptible to the observed selection bias

(4) "Being able to detect when a man is talking rot is the main if not the only purpose of education."

(5) Scientific journals suffer from publication bias

• Statistically significant experiments are only published