Why do men have nipples?

"
Fans at an Appalachia State homecoming game -- Give *ME* an "A!!"

I found this in an article of "Odd News" from Yahoo!

And why do men have nipples?

While only females have mammary glands, we all start out in a similar way in the embryo, the authors explain. The embryo follows a female template until about six weeks, when the male sex chromosome kicks in.

Men, however, have already developed nipples.

Read the rest here