communication

You find it impossible to remember what it is like to be ignorant.

A 1989 study found that better-informed agents cannot accurately anticipate the judgments and market valuations of less-informed agents.

The research specifically tested bargaining and economic decision-making, not the pedagogical or cognitive difficulty of learning new information.

The more you know, the worse you are at teaching.

Where this comes from

Study: Colin Camerer, 1989, Curse of Knowledge
What the check found: The core phenomenon is accurately attributed, but the study focused on economic bargaining outcomes, not the psychological difficulty of a beginner learning information.
Confidence: Solid, with limits

One of these every day, and every one names the study it came from. When a finding is contested, it says so.