Tennis: Referees More Likely To Make Mistakes When Calling Balls 'Out'

A universal bias in the way people perceive moving objects means that tennis referees are more likely to make mistakes when they call balls "out" than when they call them "in," according to a new report in the October 28th issue of Current Biology.

http://www.sciencedaily.com/releases/2008/10/081027121506.htm