Quiz answers... just because

On Monday I posted, in addition to comments about blog memes in general, a list of pretty silly questions. For a memory-jog, here they are again:

OK, so here's my "useless list" challenge:

1. How many pianos play in Beethoven's piano trios?
2. How long did the Hundred Years' War last?
3. What unique thing do the Echidna and the Platypus have in common?
4. What is the real title of The Beatles' "White Album"?
5. Where is Christmas Island?
6. Which is correct?: "The yolk of an egg is white." or "The yolk of an egg are white."
7. Who's on first?
8. Who's buried in Grant's Tomb?

In the spirit of so-called memes, I suppose there are no "right" answers. But since it's not one of those, there are, but they're sort of "trick questions". And so....

1. How many pianos play in Beethoven's piano trios?
   One in each. A "piano trio" is a piano and two other instruments, usually strings, usually a violin and a cello. It's not three pianos.
2. How long did the Hundred Years' War last?
   Ann and Karen both got this right in the comments: 116 years.
3. What unique thing do the Echidna and the Platypus have in common?
   Karen answered this: they're the only extant mammals that lay eggs, rather than bearing live young.
4. What is the real title of The Beatles' "White Album"?
   Karen says, "I don't think it actually has a name," which is what most people think. It's actually called "The Beatles", and the original album covers were released with that title embossed in white on the white cover, and barely visible (later releases had the title in light grey, which was more easily seen).
5. Where is Christmas Island?
   Ann and Karen both noted the one in the Indian Ocean. There's also a smaller one by that name in the Pacific, so the trick to this question is that there are two.
6. Which is correct?: "The yolk of an egg is white." or "The yolk of an egg are white."
   Karen got this right: neither; the yolk of an egg is yellow. Ann's right about the "is", of course, but missed the white/yellow swap because of the is/are distraction (as most people do).
7. Who's on first?
   I love it! Fellow square dancer Ann gave the square-dance definition of the call "Who's on first", a C4-level square dance call (and an unusual one in that it's one of the few calls that creates an asymmetric formation (another is "Face the music")). Karen gives the answer I'd been thiking of: Yes. (From the Abbott and Costello routine, of course.)
8. Who's buried in Grant's Tomb?
   As Karen says: Grant and his wife. What, you thought it was a trick question?