Why do beans cause gas? Why do men have nipples? Why do teeth chatter when you're cold? All these and many more are questions answered in an upcoming book:

New York physician Billy Goldberg, pestered by unusual questions at cocktail parties and other social gatherings over the years, puts the public's mind at ease in his book "Why Do Men Have Nipples?" which hits the book stores on Tuesday.

"It's really remarkable how often you get accosted," said Goldberg, 39. "There are the medical questions from family and friends, and then there are the drunk and outrageous questions where somebody wants to drop their pants and show you a rash or something."

The book, subtitled, "Hundreds of Questions You'd Only Ask a Doctor After Your Third Martini," (Three Rivers Press), is co-authored by humorist Mark Leyner.

In all, sounds like a good training aid for Olivia's upcoming "why?" stage. "Because I said so" is not on the list, at least not when The Grammas are around, lest the windows shatter from their triumphant "HA-HA!!!"