1. What kind of body of water, found off northeastern Canada, is named for explorer Henry Hudson?

2. What's the name of Guy Woodhouse's pregnant wife, played by Mia Farrow, in Roman Polanski's classic 1968 horror film?

3. What 7-year-old character in the book 'To Kill a Mockingbird' was based on a young Truman Capote?

4. The famous onion-domed cathedral in Moscow's Red Square is named for what Russian Orthodox saint?

5. For coin collectors, what is the highest-quality grade of coin, named for a place where uncirculated coins can be found?

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