Hecho general: 9603 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 9603 is an uninteresting number.
Trivia: 9603 is an uninteresting number.
Fecha histórica: April 16th is the day in 1941 that Bob Feller of the Cleveland Indians throws the only Opening Day no-hitter in the history of Major League Baseball, beating the Chicago White Sox 1-0.