Why do men have nipples, anyway?

It's an interesting question and one that was answered, along with hundreds of other odd inquiries about the human body, in last year's surprise best-seller, "Why Do Men Have Nipples?"

In their sequel, "Why Do Men Fall Asleep After Sex?" authors Mark Leyner and Dr. Billy Goldberg, offer more witty and wise answers to burning questions about the human body.

Here are three examples:

1. Do toads cause warts?

"Poor, poor toads. They seem to always take a backseat to frogs. Frogs get kissed and turn into princes and toads just get to cause warts. Well, here is some good news for toads. Toads do not cause warts."

2. What are those dust particles you sometimes see floating in front of your eyes?

"These floating spots are very common and arise because our eyes are filled with clear gel called vitreous humor, which, as times goes by, can partially liquefy to form small condensations, opacities, and debris. These opacities float through the vitreous as the eye moves, casting shadows on the retina. ... We perceive these shadows as 'floaters.' ... Most of the time, floaters are benign, but in rare cases they can signal a serious problem, such as retinal tear or detachment."

3. Why do I sneeze when I pluck my eyebrows?

"Plucking a hair from your eyebrow stimulates a nearby branch of the nerve that services your nasal passages. And even though these impulses don't originate in your nose, the eyebrow plucking sensitizes the entire nerve, enabling sufficient impulses to reach the sneezing center ... and you sternutate (that's sneeze, in dorky doctorspeak)."