One answer per person for the first 24 hrs, please. Thanks!

-1. Sometimes referred to as a "school", what is the generally-accepted collective noun for a group of dolphins?
-2. In 1917, Finland declared independence from which country?
-3. William Hinckey attempted to assassinate who in 1981?
-4. Black water fever is a serious complication of which infectious disease?
-5. John Williams and Herbie Flowers formed which rock/classical/jazz group in 1979?
-6. In medieval Jewish folklore, what name was given to an automaton that could be brought to life by a charm?
-7. In a Mozart opera, whose servant was Leperello?
-8. Who, in 1924, painted The Laughing Cavalier?
-9. Which gas smells like rotten eggs?
-10. If you ordered nigiri in a Japanese restaurant what would you be served?
-11. Which reluctant (at least on his part) pair of lovers spoke this dialogue:-
        Female: “------, will you dance with me?”
        Male:     “---- -----, I will dance with you when the grass grows red, the Sun goes out, and the oceans turn to yogurt.”
        Female:  “I’ll take that as a ‘maybe’.”
-12. This is a still from which movie?

12. Groundhog Day

Yes, jb!

8. Frans Hals

Bernie

3. Reagan

Bernie, Marian - good calls!

2. In 1917, Finland declared independence from which country? Russia

Russia it was, Ff!

Da, da.

12. Groundhog Day

1. Pod

Nice one, Mad!

jboliver's snaffled that one, manxman. I forgot to cross it off. Apologies - try another?

4. Malaria

6. golem

9. It's either natural gas or farts, take your pick.

9. pretty sure it's sulfur

5. Sky

michele, manxman, Lady K - can't argue with any of them!

As for the other suggestions, all sniffing around the answer I'm looking for (a chemical name)

9. sulfur

Part of it is

9. hydrogen sulfide

10. sushi

11. Kermit and Miss Piggy

Excellent! And that leaves only the one...

7. Leporello is Don Giovanni's servant.