UNCERTAINTY PRINCIPLE
Credit: LA Times Crossword
Sylvia Bursztyn and Barry Tunick (adapted)

The answers to the following clues will have something in common.

1. Mr. Wilson's nemesis in the comics
2. Danger on three fronts
3. Give a ballpark estimate
4. Real estate speculation, for one
5. 1947 film spoofing silent movies
6. "A little knowledge," according to Alexander Pope
7. Double dog, for one
8. It can happen in middle age
9. Monopoly card
10. Protection from being tried twice for the same thing
11. Partner of Procter

Answers:

1. Dennis the Menace
2. Triple threat
3. Hazard a guess
4. Risky business
5. Perils of Pauline
6. Dangerous thing
7. Dare
8. Crisis
9. Chance
10. Double jeopardy
11. Gamble