1. A dish served au gratin is sprinkled with bread crumbs and what other ingredient?

2. Whose parents hired "miracle worker" Anne Sullivan as her tutor in 1886, on the advice of inventor Alexander Graham Bell?

3. The Constitution, renamed Enterprise in 1976 at the urging of Star Trek fans, was the prototype for what craft?

4. At the climax of Alfred Hitchcock's 'North by Northwest,' Cary Grant dangles from what American monument?

5. What painting by Emanuel Leutze depicts the events of Christmas night, 1776, before the Battle of Trenton?

What’s the "Kennection" between all five answers?