More Notable Birthdays on July 21: 1978 - Josh Hartnett, born in St. Paul, Minnesota, film producer, actor, movies include 'Black Hawk Down', 'Pearl Harbor', People magazine's 50 Most Beautiful People 2002 1948 - Garry Trudeau, political cartoonist, Doonesbury 1911 - Marshall McLuhan, born in Canada, writer, Medium is the Massage 1899 - Ernest Hemingway, born in Oak Park, for whom the bell tolled..., Nobel 1954