On the last day of every golf tournament, Tiger Woods insists on wearing a bright red polo shirt. Woods says the habit is merely superstition, but new research suggests that his fashion sense might actually come with athletic benefits. A paper published this month in Psychological Science reports that referees and umpires subconsciously favor competitors in red uniforms. The experiment was clever: the scientists showed 42 experienced tae kwon do referees video clips of five different male...