1. In what Shakespeare play does Marcellus tell Horatio, “Something is rotten in the state of Denmark”?

2. In 2010, Iran banned what “party in the back” hairdo, popularized here by country singers like Billy Ray Cyrus and Travis Tritt?

3. Curling is the only ice-arena sport in the Winter Olympics that doesn’t require athletes to know how to do what?

4. In what 2000 movie did Ed Harris direct himself to an Oscar nod for playing the creator of “action painting”?

5. What was the name of an 1806 expedition, led by an American captain named Zebulon, that mapped a namesake Colorado peak?

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