What Do Ovaries and Popcorn Have in Common?

A friend of long ago once said she'd been raised in a Catholic school where the nuns shied from sex education and talking much about those parts of our bodies that have to do with sex and reproduction. However, for whatever reason, they did try, probably to prepare girls for the day that they would start to bleed and therefore be able to bring about more humans. The friend said the nuns explained ovaries as being like a popcorn popper, popping ripe kernels into full blossomed eggs.

An odd...