What is Open loop?
An open loop is the technique of creating a curiosity gap: presenting a question, a number or a promise at the start and delaying the answer to the end. "The third mistake is the most common" on the cover makes the person swipe to the third slide; "at the end I will tell you what happened" holds the video to the last second. It works because the brain wants to close what was left open. The limit is honesty: if the answer does not live up to the promise, the next opening will be ignored.