Manfred von Richthofen, aka the "Red Baron," was the highest-scoring fighter ... If I took up a piece of paper it disappeared. My safety helmet slid off. My muffler dropped off.

Write your answers on a separate piece of paper. After looking at the first fact set, how did you think the mess was created? How did that explanation change when you looked at subsequent fact sets?

Even their critics noted its influence, with one analysis calling the paper “so well known that it is used by authors and requested by reviewers almost reflexively.” Baron, a professor ...