I can't decide which

But whichever one it is I am pleased no end.

Either

1) We have incredible insulation between the units in my condo building.

Or

2) My next-door neighbors have the world's quietest baby (he turned six months old in March).

I have yet to hear anything coming from next door that sounds remotely like a baby, or, actually anything at all.

He's adorable, the few times I've seen him, but seriously? This is the best of both worlds.

another Kindle question

So. I started making some collections on my Kindle and putting books into them, because I'm a former librarian and books Must Be Organized. But I can't figure out how to add books to an existing collection that I made, say, last night (as opposed to starting another collection). Help?