Who knew that there are "dyslexia friendly" fonts? From Freakonomics:

 As a lunch-table discussion here in England revealed, the University insists on certain typefaces that are dyslexia-friendly, particularly Arial, Trebuchet, and Verdana.  It costs me or any other faculty member nothing to use one of these on exams; non-dyslexic students are not harmed by them, and dyslexic students are better off.