What I just learned:

Bed-and-breakfast is spelled with hyphens.

It never occurred to me to look it up before, but this morning I wanted to see if the abbreviation, B&B, had spaces. (For example, R & D, research and development, should be spelled with spaces between the characters.) I learned that neither B&B nor B & B is in Webster's, but "b and b" is, so I concluded that the abbreviation needed spaces. When I looked at the definition of "b and b" I noticed the hyphens in bed-and-breakfast, looked it up, and learned something new.

Now you maybe have too. Use this knowledge to impress others. You're welcome.